Intake heater light

Mar 5, 2009 · 2004 FREIGHTLINER INTAKE HEATER LIGHT ON ALL THE TIME WHEN VEHICLE IS ON/RUNNING. Answered in 2 hours by: Technician: Diesel Pro. Diesel Pro. Category: Heavy Equipment. Satisfied Customers: 94. Experience: 12yrs exp with CAT/Cummins/Dietroit Diesel/EMD engines.Computer Diagnosis Business.ASE Certified. Verified. Hello Chris, Yeah i think its basically a glow plug idea for the intake air..Might be a lil harder starting when cold but no biggie.. Im shocked a volvo dealer did have software for it.. craig_sez , Feb 22, 2017TWR. 1940 posts · Joined 2011. #3 · Jan 19, 2016. check the intake manifold air temperature sensor this sensor tells the ECM when to turn the grid heater on by what temp the intake is as i recall anything under 66 degrees it does not turn the heater on anything below 66 at start it turns it on the grid heater.Intake Grid Heater Light Comes On. ... 10 dings with grid light indicates what cerberusiam is talking about. Steps involved as far as prognosis. Last step is injectors. -2008 6.7l QCLB 4x4,g56,J-67(23ME),valair DD,64.5/72/14,2nd gen …I wanted to know if there was a constant voltage delivered to the ECM Leads at the intake heater relay? With the key in the on position, I have 12 volts showing at both of the intake heater really positive terminals. Once the Wait to start light goes out, there is a voltage of 3.55V maintained until several seconds after the key is turned off.I replaced our 250a fuse once cleared codes and came back. Researched and realized the intake transformer / solenoid for the heater was faulty. A $39 part from Freightliner fixed. Cleared codes and all good. Both are located looking down bath hatch on passenger side left of valve cover. Verify wiring in intake alsoI found that made a big difference in cold weather starting. SCT, no studs...yet, Dual OEM intake air filter housings, Banks intercooler & intake elbow, Banks exhaust syatem, Windrunner ported intake manifold, Bullet Proof Diesel remote oil cooler & thermostat, AirDog2 (plus a couple spares), Power steering filter (Amsoil dual-bypass), …

A.our portable gas-fired infra-red heater comes fully assembled Y and is tested at the factory for proper gas and input as stated . on the nameplate. B.ch heater is equipped with a 100% safety shutoff, push Ea button valve which will automatically stop the flow of gas in . the event the heater fails to operate for any reason. A tip over5 posts · Joined 2017. #1 · Apr 19, 2017. I have an 05 2500 with a stage 2 bd turbo, 90 over injectors and a smarty touch tuner. My grid heater light keeps coming on while I'm driving along with ten dings. It normally comes on while driving 65+ then will go away. I'm not throwing any codes.Details. Product Information. Warranty: Limited Lifetime Warranty. Unit of Measure: Each. UPC: # 727943290588. Terminal Type: Screw. Terminal Gender: Male. Voltage (V): 12 …Heater feed posts to neg. batt. or engine grnd. show 0.9 ohm. with heater feed cables disconnected. With WTS light on, voltage at heater terminal is 10.6V, then goes to 0 after WTS light goes out. With WTS light out, engine running at idle, voltage to heater feed terminals do not return to 10.6V, or any other positive voltage, After 1 min..open a can of worms. essentially there have been. a few cases of the grid heater bolt breaking off and finding a home pounded into the top of cylinder 6. the belief is the bolt loosens and electrical current arcs causing it to fall off, or constant elec current arcs causing it to fall into intake.Nov 28, 2011 · The truck is throwing a Check engine code 70 (inlet air heater driver #1 fault> mode 13-out of calibration). Kinda new to this diesel stuff so sorry for the dumb questions. This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread. 92 posts · Joined 2004. #2 · Dec 5, 2004. There is a small solenoid near the terminal of the heater element with a short cable from the output of the solenoid to the element terminal, make sure you have 12v to the input and that the the solenoid is being activated and that the solenoid works properly, i have never seen one go bad but thats ...

1425 posts · Joined 2012. #1 · Dec 8, 2012. So I'm going to be deleting my intake air heater, and I'm not sure what to change. Under the engine calibrations and the intake heater section, there is a: intake heater timer (IAT), intake heater timer (ECT), intake heater timer (Baro), intake heater key-on disable and intake heater time allowed.469 posts · Joined 2009. #11 · Oct 25, 2009. Unplugged the maf sensor, removed the box, enlarged the holes on the side and opened a triangular one in the front. Just like the info on Kennedy diesel page. Holes are below the filter. Reinstalled the air box an filter.Product details. The New Lifesmart Infrared Heater brings the warmth and reliable heating anywhere in your home without needing to be installed. Using 6 quartz infrared elements to produce comfort and heat. Perfect for heating rooms in your home with its 3 heat settings 1000 watt/1500 watt and an ECO mode that maintains a constant 68 degrees.The Lifesmart Infrared Fireplace Heater brings the warmth and beauty of a fireplace anywhere in your home without needing to be installed. Using 6 quartz infrared elements to produce comfort and heat. Perfect for heating rooms in your home with its 3 heat settings 1000 watt/1500 watt and an ECO mode that maintains a constant 68 degrees.

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Details. Product Information. Warranty: Limited Lifetime Warranty. Unit of Measure: Each. UPC: # 727943290588. Terminal Type: Screw. Terminal Gender: Male. Voltage (V): 12 …Hoping the CEL and P1451 and P242F codes were thrown just because the air intake was disconnected by bonehead dealer for 20 miles. 2007.5 Dodge Ram 3500 Laramie 4WD QC LB DRW 3.73 Patriot Blue Save Share1999 Dodge Cummins - No wait to start light. Replaced the intake heater. Intake heater solenoids. Would work for for a day and stop. Changed the temperature sensor and nothing. Disconnected the solenoid wire from the battery and reconnected it. Worked for 3 days then stopped when I replaced the battery terminals. Tested the wires.620 posts · Joined 2009. #7 · Nov 13, 2014. The check engine light is probably on because you unplugged the sensors on the intake when you removed it. The remote start is disabled any time the check engine light is on. The cycling is normal I think until the truck warms up.Test the High-Pressure Relief - This is fairly simple with an advanced scan tool. Just command the regulator up to achieve max fuel pressure. This should be somewhere around 27,500 psi. The relief valve is a calibrated mechanical spring that opens to return fuel back to the fuel filter, thus limiting max fuel pressure.Dieseler said: Needs to be colder out for the light to come on. 8 deg celcius is not cold when it gets down to freezing out will it come on. The manual says the glow heater comes on at 5c but when your testing the glow plug indicator light it should come on for between 15-19.5 seconds when you turn the ignition to G.

255 posts · Joined 2005. #1 · Dec 30, 2007. My dad has a Bluebird bus (Frieghtliner chassis) with a 2000 CAT 3126 engine. Since the weather turned cold here in CA (33 degrees F overnight) the engine has been more difficult to start. It is taking 6 or so 30 second cranks to get it started. Oct 2011. Posts. 9. The grid heater light on and the dinging sounds like that "feature" that Dodge incorporated into the ECM firmware a few years ago. Google P1222/P1223 DTC's and you will find a ton of info on this. Like Easymon mentioned, you have a high side fuel system issue. Ram Year. 2006. Engine. 5.9 Cummins. 2006 ram 3500 5.9 dually. My check engine light for the intake heater came on last year and just now getting around to fixing it. So today I replaced the intake grid heater and the heater relay today and i still have no luck. The relay has 4 terminals on it. Should be hooked up properly.I have a 2006 Bluebird Vision with a C7 Cat giving me fits. The "wait to start" light is on constantly KOEO or engine running and the grid heater is never activated at cold start up. If I supply power and ground to the solenoid it activates and the heater works as it should, with the signal wires disconnected I have ground on one and 7.2 Volts ...This should abort the grid heater cycle and self test that throws the light. Ambient temp and coolant temp can also abort a cycle. For a year i turned the key instantly with the grid heater attached. It would skip the pre heat cycle but i still felt like it was cycling after startup. I can not confirm this 100% though.I wanted to know if there was a constant voltage delivered to the ECM Leads at the intake heater relay? With the key in the on position, I have 12 volts showing at both of the intake heater really positive terminals. Once the Wait to start light goes out, there is a voltage of 3.55V maintained until several seconds after the key is turned off.Jan 12, 2016 ... In this video I will be showing you how to delete the intake heater on the LB7 Duramax the reason we are removing this is because of the ...The intake air heater (IAH) is located in the air inlet tube and is used to warm the incoming air to aid in starting the engine and for proper cylinder combustion. The glow plug control module (GPCM) will command the IAH on when the engine coolant temperature is below 140F. 05 Chevy 2500 CCSB.

The schematics for the original control can be found in the free electronic manual, page 8W-30-48. It will give you required wire sizes and show you one option for control. The PCM used to control the grounding of the relay coils. Note that the power supply wires used to be 6 gauge. 97 2500HD Club Cab, 4x4, automatic.

34 posts · Joined 2009. #1 · Dec 21, 2009. I just bought a 2006 GMC K3500 with the LBZ and 114000 miles on it .I have put about a 1000 miles on it and now have a engine light with code P0540 Intake Air (IA) Heater Feedback Circuit.I did a vin check and found out they replaced the glow plug controller right before I bought it ,does the glow ...Monitor heaters may turn off unexpectedly due to a clogged fuel filter, the air in the fuel line, or a malfunctioning thermostat. A clogged fuel filter can restrict fuel flow, causing the heater to shut down. Air in the fuel line can also disrupt fuel flow and lead to the heater turning off. A faulty thermostat may not accurately regulate the ...Air ducts are also needed to route the warm air to the intake and electrical connections and wiring control the operation of these components. Trouble code P0542 is triggered by the PCM when it receives a high signal from the intake air heater "A" circuit. The circuit may be out of range, contain a faulty component or have improper airflow.samdweezel05. 1518 posts · Joined 2008. #2 · Nov 12, 2009. If the intake air heater is not working you will get a code. Take the nut off the wire (8 or 10 MM socket) and remove it, and start the truck. The check engine light will come on. If you can read the code it will tell you the intake air heater voltage is low.Intake heater SES light Jump to Latest Follow 4K views 6 replies 5 participants last post by meyer7.3l Apr 9, 2015I just remember to fire it off before the grid heater light goes off. This should abort the grid heater cycle and self test that throws the light. Ambient temp and coolant temp can also abort a cycle. ... Images of nut and intake plenum without grid heater . Attachments. 20210307_140903.jpg. 1.6 MB Views: 188. Screenshot_20210313 …Jan 12, 2016 ... In this video I will be showing you how to delete the intake heater on the LB7 Duramax the reason we are removing this is because of the ...Details. Product Information. Warranty: Limited Lifetime Warranty. Unit of Measure: Each. UPC: # 727943290588. Terminal Type: Screw. Terminal Gender: Male. Voltage (V): 12 …381 posts · Joined 2011. #1 · Feb 10, 2016. Recently had my grid heater replaced due to check engine light and air intake code. Today I started the truck and the heater came on before start and then threw a check engine light. Took it to the dealer and they checked it out, and was the same code as before when the grid heater was replaced.DTC P0541 stands for “Intake Air Heater “A” Circuit Low,” and it’s logged when the PCM detects a problem with your vehicle’s intake air heater. Bad intake air heaters and relays, a faulty PCM, and wiring problems are some of the issues that could trigger the code. Common indicators of code P0541 include a lit check engine light, a ...

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The wait to start light should always come on for awhile. Even though my grid heaters are controlled by a toggle switch the PCM still keeps the light on for an extended time in the winter. 97 3500, 2 WD, G56, slightly bombed, over 1.5 million miles with un-additized diesel fuel. Oct 2011. Posts. 9. The grid heater light on and the dinging sounds like that "feature" that Dodge incorporated into the ECM firmware a few years ago. Google P1222/P1223 DTC's and you will find a ton of info on this. Like Easymon mentioned, you have a high side fuel system issue. i have fl 8o with 3126 intake heater light will stay on or keeps coming on draining my alternator. Answered in 6 minutes by: Technician: Cat Man. Hi. Thanks for using JA! I will try and help you out. The most likely cause of your problem is a faulty Inlet Heater relay. I have seen this before. The relay is located on top of the engine and ...P2605 is a diagnostic trouble code (DTC) for "Intake Air Heater A Circuit". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $154.99 .163. Wait to start light is not coming on. But engine starts. The wait to start light is for the engine intake air heater. When key is first turned on, all the lights on the dash come on for a couple of seconds, including the wait to start light. But it used to stay on for a few seconds after that, then go off signaling it was time to turn the ...removing any obstacle in the path of airflow is a benefit! in this case the intake heater takes up about 50% of the real estate inside the y bridge. anything forced to move, naturally takes the path of least resistance. just like electricity. 06 GMC reg.cab dually 4x4, Red, s478 w/2.6 cover, built motor, mike l. stg4/1055.I've grafted a cummins intake heater grid onto my toyota 2L engine to assist with wintertime starting. It works great and I was able to start the engine at 17 F tonight with just the grid heater, no glow plugs. ... Anyway, offhand the wait to start light stays on for about 10 or 15 seconds before going off. Then will cycle for about 3~5 seconds ...Three conditions must exist before the inlet air heater will operate in the pre-heat cycle: 1. The ignition switch must be in the "RUN" position. 2. The coolant temperature is below the lower limit of the temperature switch. 3. The inlet air heater has not timed out for thirty seconds in the pre-heat cycle.In any case, the grid heater should fire (without the orange coil light) after startup. Are you seeing post-start grid cycling? 2008 6.7 Quad cab SB, G56, 3.73, black, Edge Insight, 285-70/17 BFG, Bilstein 5100 shocks, MagHytec rear …Just started having the intake heater light stay on while driving it all the time also noticed a small amount of white smoke on start up. I've read that it shouldnt be on …You can buy EdenPURE’s innovative products, such as heaters, through the company website, you can also use the dealer locator on the company website to find the nearest EdenPURE de... RAM owners are typically alerted by a check engine light. Using an OBD scan tool, P2609 and/or P0542 diagnostic trouble codes are often present. A P2609 code indicates an issue with the intake air heater system voltage or performance and often means the grid heater bolt is failing and has lost its ability to conduct current. ….

Well the intake heater is a grid in the intake manifold. There is a solenoid mounted near the top of the intake manifold. Check those connections and the connection at the grid. You will have power at one of the main bigger studs all the time on it. The abs you will need to get it connected to a scanner or the toolbox program to get the faults.Dec 30, 2023 · 5. #1 INTAKE AIR HEATER RELAY Disconnect the #1 intake air heater relay signal wire. Connect a jumper wire from the signal terminal of the #1 intake air heater relay to battery positive. Q: Did the relay click when 12 volts was applied? YES: Go To 6 NO: Replace #1 Intake Air Heater Relay. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Industry Leading Solutions for Automotive and Light Duty Truck Applications. Leading OEM and aftermarket companies trust PTI to provide quality heating and electric solutions. Phillips & Temro’s design, manufacturing, testing and validation labs enable PTI engineers to create reliable products for your company every day.185 posts · Joined 2014. #5 · Mar 31, 2017. Not sure what bolt it was honestly. Tech just said it came from the grid heater. The truck has not had any engine work performed other than a water pump. After tech said he had seen another 1 that happened under 100k we did ask FCA and was told it was out of warranty and they would do nothing.Jan 12, 2010. Staff. #9. The ECM monitors the circuit for continuity when the intake heater isn't on as the heater will read an almost dead short to ground, and then it reads 12 volts + when the realy is on. You could probably use a resistor and make it act as the heater to get rid of the codes without EFILIVE.Feb 9, 2021 ... Comments26 ; Pusher Install - 6.7L Dodge Cummins Heater Grid Delete. Pusher Intakes · 107K views ; 2017 RAM 6.7 Cummins Heater Grid Bolt Disconnect ...Aug 21, 2018 · The intake heater grid light on the dash came on and it dos. the intake heater grid light on the dash came on and it dos not go out. Chris (aka-Moose) Technician. 3,024 satisfied customers. Glow plug light stays on. The glow plug light. 2006 2500. I was driving. It started ringing and the light came on. 2000 F-250 Super duty extened cab 4x4 7.3L Powerstroke. DP tuner 4 pos chip (Jody T) Garrett BB Turbo, magnaflow 4 inch turbo back exhaust. AFE Stage II intake Pro 7. Auto meter gauges, AIH Plug, deleted EBV, Warn 12,000lb winch,4 385,000cp KC Lights, Transformer brush guard and winch carrier, high presure cross over kit.There were different key switches available. Some you turn to the left and hold it. Some switches are to the right and go off, on, heater, then way to the right to start. You will need to use a VOM and do a bit of testing to figure out what yours is. While trying to figure it out.. remember to push the key IN.. Intake heater light, SLIMLINE INFRARED HEATER – FRONT AIR INTAKE VENT UV LIGHT. MSRP $119. MODEL #HT1154UV. PRODUCT SPECS. Powerful Heating: two quartz infrared heating elements and one smart boost heating elements for faster heat up. 3 heat settings: 1,000w /. 1,500w / and ECO-maintains. a constant 68º. , Pulled the power lead from the heater and reset power loop with ~12V showing for the circuit to the heater without heater in the loop. So, it seems the heater itself is toasted out. Next i will attempt to test the heater, any suggestion other than be careful if it works it will get hot. Jun 1, 2018 / Testing the intake manifold heater timer #10., 813 posts · Joined 2007. #1 · Nov 18, 2009. Started the truck yesterday and check engine light came on. Checked codes with Smarty and there were two of them. They were P2609- No voltage drop seen from intake air heater and P0542- High voltage on the #1intake air heater relay. After checking the codes I noticed that my grid heater is not ..., Modern space saving design and innovative front air intake with UV light allows this heater to be placed directly against the wall without constricted air flow or overheating. UV LED light helps kill germs and viruses brought into the heater and returns clean air into the room. The smart boost technology reaches the maximum heat level up to 50% ..., 813 posts · Joined 2007. #1 · Nov 18, 2009. Started the truck yesterday and check engine light came on. Checked codes with Smarty and there were two of them. They were P2609- No voltage drop seen from intake air heater and P0542- High voltage on the #1intake air heater relay. After checking the codes I noticed that my grid heater is not ..., According to the USDA, calorie intake is based on a variety of factors including age, gender, height, weight, and level of activity. The recommended intake for an adult female is a..., 1999 Dodge Cummins - No wait to start light. Replaced the intake heater. Intake heater solenoids. Would work for for a day and stop. Changed the temperature sensor and nothing. Disconnected the solenoid wire from the battery and reconnected it. Worked for 3 days then stopped when I replaced the battery terminals. Tested the wires., Sep 6, 2020 ... 3rd Gen Engine and Drivetrain -> 2003-2007 - Grid Heater Light Comes on While Driving / Gongs plus White Smoke - On this latest trip, ..., In any case, the grid heater should fire (without the orange coil light) after startup. Are you seeing post-start grid cycling? 2008 6.7 Quad cab SB, G56, 3.73, black, Edge Insight, 285-70/17 BFG, Bilstein 5100 shocks, MagHytec rear …, In today’s fast-paced world, businesses need to prioritize customer experience to stay ahead of the competition. One way to enhance the customer journey is by implementing a well-d..., A P2609 OBD-II trouble code means that the variation in the voltage to one or more of the intake air heater circuits has exceeded the manufacturer's stipulated levels. The resulting stored code results in an illuminated Check Engine light, though some models of vehicles might require multiple drive cycles, at least three, before the Service ..., Shop Lifesmart 6-Element Infrared Heater with Front Intake Vent and UV Light Black at Best Buy. Find low everyday prices and buy online for delivery or in-store pick-up. Price …, Purpose is to warm air going from the intake manifold into the engine during starting. It is on when the "Wait To Start" light on your dash is on. Cummins uses it …, OEM Mopar 5187880AC replacement Intake Heater Grid Relay for the 2006 to 2018 Dodge Ram diesel trucks with Cummins 5.9L and 6.7L Cummins engines. The intake heater grid relay regulates the current applied to the heater grid to ensure a quick start in cold weather., Air ducts are also needed to route the warm air to the intake and electrical connections and wiring control the operation of these components. Trouble code P0541 is triggered by the PCM when it receives a low signal from the intake air heater "A" circuit. The circuit may be out of range, contain a faulty component or have improper airflow., The 1999.5-2003 7.3L Power Stroke came equipped with a factory Air Intake Heater (AIH) that can be found in intake tract. The AIH is modulated by the pcm via a relay that is located next to the glow plug relay. This intake heater protrudes directly into the air stream in the cold side of the intake manifold and blocks approximately 20 percent ..., RAM owners are typically alerted by a check engine light. Using an OBD scan tool, P2609 and/or P0542 diagnostic trouble codes are often present. A P2609 code indicates an issue with the intake air heater system voltage or performance and often means the grid heater bolt is failing and has lost its ability to conduct current., The WTS start light flashing is really a big flashing warning light. Chrysler programmed that flashing light to warn the driver to shut the engine down before a failing …, 07 6.7L Air Intake Heater - to delete or not to delete. I wouldn't call myself a complete DIY'er. I do about 70% of the fixes myself, and about 20% w shops, and only if I have no other choice, do a ever go to a dealer. So, I had my computer crash about 6 weeks ago. The PCM or ECM and a fuel pump was 3500 at the dealer., Yeah i think its basically a glow plug idea for the intake air..Might be a lil harder starting when cold but no biggie.. Im shocked a volvo dealer did have software for it.. craig_sez , Feb 22, 2017, Different JD models engage the heater in different ways. The manual for yours says to push in the key. I-Cold Start Indicator Light: Indicates that the ignition key is being pressed in and that the air manifold heater is on and heating the intake air to the cylinders, allowing faster starting in cold weather. Mar 19, 2010 / air intake heater #5., Air ducts are also needed to route the warm air to the intake and electrical connections and wiring control the operation of these components. Trouble code P2609 is triggered by the PCM when it detects a performance problem within the intake air heater system. The circuit may be out of range, contain a faulty component or have improper airflow., Since coal is usually burned to generate electricity for homes, it can be conserved by using energy-efficient bulbs for lighting and by conserving the energy consumed by house heat..., The ASPCA (American Society for the Prevention of Cruelty to Animals) is a renowned organization dedicated to rescuing and protecting animals in need. Their animal rescue process i..., 2002 GMC Sierra 3500 w/LB7, service engine light has been on since I bought it 2 months ago. Codes indicate it's the Intake Air Heater Circuit. I took this to mean the heater itself needed changed, so I did. Light stayed on. So . . . I disconnect both pos. on battery for 30-40 minutes and when reconnected, light stayed on., This video explains how to identify and prevent RAM grid heater failure from occurring, thereby avoiding costly repairs or engine replacement. Banks Power. The Leader in Diesel Performance. 800-601-8072. Factory Direct ... How to engineer a racing intake. When designing th. Hoonigan's Diesel Mistake - The guys at Hoonigan t. Nitrous oxide makes ..., Jan 17, 2018 · Three conditions must exist before the inlet air heater will operate in the pre-heat cycle: 1. The ignition switch must be in the "RUN" position. 2. The coolant temperature is below the lower limit of the temperature switch. 3. The inlet air heater has not timed out for thirty seconds in the pre-heat cycle. , Just started having the intake heater light stay on while driving it all the time also noticed a small amount of white smoke on start up. I've read that it shouldnt be on …, The Lifesmart Infrared Fireplace Heater brings the warmth and beauty of a fireplace anywhere in your home without needing to be installed. Using 6 quartz infrared elements to produce comfort and heat. Perfect for heating rooms in your home with its 3 heat settings 1000 watt/1500 watt and an ECO mode that maintains a constant 68 degrees., This system will operate when the sum of coolant temp and inlet air temp is less than 109* F. Make sure to wait to start until the intake air heater light goes out. The easiest way to see if the heater is working is to pull the air intake pipe off of the intake manifold. You should see the heater grid glow red like a toaster when the light is on., I have a 93 5.9L cummins 3/4 ton dodge truck when starting there is no power going to intake heaters nor does the wait to start light come on but once started power goes to intake heaters and wait to … read more, The only way I can get it to start is by planting a 100W light bulb on the air intake heater housing for 1-2 hours. Obviously , the electric air intake heater is not working (despite the "glow plug" light on the dash lighting up for 10 seconds, which it does). The housing does NOT heat up. I've replaced the ($155! from a JD dealer) control module., Jan 1, 2008 · Dave B. in VA. Yes, the Dodge system does drop the alternator offline during grid heater operation. Folks who have grid delete spacers report that the truck goes through the motions of pulsing the heaters. The voltmeter will drop when the heaters were supposed to be on because the alternator is offline.