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I copied this from my GM service manual for 1982 6.2 diesel.
1. If the glow plug relay is not clicking on and off then turn the ignition to the RUN position and connect a 12V test light to ground and touch the pink/black wire in the glow plug relay connector.
2. If the light is off repair the open cicuit in the pink/black wire to the splice.If the light is on then touch the light blue at the glow plug relay connector.
3. If the light is off replace the glow plug relay. If the light is on, disconnect the connection at the thermal controller and touch the black wire in the connector.
4. If the light is off, repair the open circuit in the light blue wire from the thermal controller to the glow plug relay. If the light is on repair open circuit in black wire back to a splice. If no trouble is found replace the controller.
You should also get your hands on this Haynes book. Diesel Engine Repair Manual, part # 10330. Excellent coverage on the 6.2 and 6.5. In it, they say that early 82\'s have a hole at the number 2 hole on the pin connector of the wire harness for the thermal controller. this allows dirt in there and corrodes the pins. Remove the connector and clean thoroughly the pin area on the connection and controller. Seal the hole with some silicone. If things are still acting up, replace the wire harness connector.
Hi Mike: Glow plugs-on fed truck usually the controller-on cal.equipped truck usually glowplugs themselves.
We are assuming the you have some of this codes:
- P0380 Glow Plug/Heater Circuit A Malfunction
- P0381 Glow Plug/Heater Indicator Circuit Malfunction
I found this after searching this and other diesel sites for about a week glow plugs are covered on factory extended warranty-10 years or 200000 miles call GM @ 1-800-462-8782 have VIN# ready
Models: 2002 - 04 Chevrolet Silverado
2002 - 04 GMC Sierra
Equipped with 6.6L Diesel V8 (RPO LB7 - VIN 1) Engine; and California Emissions (YF5/NE1), or Clean Fuel Emissions (VCL)
Condition: Some customers of 2002 - 04 model year Chevrolet Silverado;
and GMC Sierra trucks, equipped with a 6.6L diesel V8 (LB7) engine, and
California emissions (YF5/NE1), or Clean Fuel Fleet emissions (VCL), may
experience a condition where the engine glow plugs may fail. Failure of
the glow plugs on these vehicles will cause illumination of the MIL.
Also, depending on the ambient cold start conditions and the number of
glow plugs failing open, some customers may also comment about hard
starting, misfiring and white smoking after cold start.
Customer Notification: General Motors will notify customers of this
special coverage on their vehicles (see copy of typical customer letter
included with this bulletin - actual divisional letter may vary
slightly).
Ask your local dealer.
Hope this helps; also keep in mind that your
feedback is important and I will appreciate your time and consideration if
you leave some testimonial comment about this answer.
If it cranks and won't start then it is probably your glow plug system which is used to help with starting as diesel engines have no plugs and rely on compression. It also helps to run a lighter oil in the winter so it will crank faster. You can ohm out the plugs to see if they are broken. I am not sure of the wiring on the GMC but usually diesels have several wired in parallel
First off the glow plugs are not the problem. Diesel's run purely off of compression. The basic principle behind them is compress the gas and and it will "spontaneously" ignite as long an the cylinder is hot. All glow plugs do is provide the initial heat that is needed. Once it is started they shut off. If you turn your engine off for a little while and then crank it back up, the glow plugs won't come back on as long as the engine is still warm. So now onto the actual problem. You have a FSD (Fuel Supply Driver) also known as a PMD (Pump Mounted Driver) that is failing. It tells the fuel injection pump when and where to deliver fuel. When they start going bad you will notice hestitation, to random stalls (usually when hot) to no-start situations. There is a forum I found which goes into much greater detail about it and how to fix it and help prevent it from happening again. CHeck it out. 6 5 NEWBIES START HERE
And here is a relocation harness kit made by Dorman: Amazon com Dorman 904 113 PMD Relocation Kit Automotive
You are probably going to find four wires together that do not have a plug on them. There should also be a tag taped on the wires showing that it is for the trailer. You will have to put a plug or some kind of connection on those wires.
The diagram is simple each glow plug is connected in a series circuit like this -0-0-0-0-0-0-0 that's a in-line 6 for a V-8 it would look like this
[-0-0-0-0
[-0-0-0-0
and the plugs would be hooked up on the back then if you follow the wire to the glow plug relay you will find that the relay has four wires one to battery one to the glow plugs one to the ignition switch and one to ground in the box. If you want you can purchase a manual for 5.99 on-line. and it covers the three fuse-able links for this system and the new Glow plugs available for this truck here is the web page. http://www.wiring-diagram.com/?gclid=CMuAvJ3Ql58CFQZfagod0jpAxQ
Go to your local auto parts store and look for a book, Haynes Diesel Engine Repair Manual, Part number 10330. It has your wiring diagram and a lot more. I got mine at Canadian Tire.
there is a injector driver module relocation kit with a heat sink to mount it to because the module in the orgional location the module would overheat. also check the glow plugs the quick easy way to do this without removing them is to unplug all the glow plugs then hook a jumper wire up to battery positive and and touch it to each glow plug there should be a spark and if there isn't then the glow plug is bad.
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