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help with strange electricial issue

tryn2 said:
have one belt that runs everything ..it goes across water pump,ps,crank,cam,ac,and etc..can it run with no belt on it at all?
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We are dealing with a Duramax engine. The water pump is gear driven and NOT fun to change. The fan shaft is just an idler bearing. So you will have water flow with the belt off.

Will has a good idea. I posted above how to check the alternator connections. So you are testing the battery charge wire and the wires in the alt plug. How did the test turn out?
 
Yes the other vehicle was running. The engine on the duramax wouldn't start with the jumper cables on it, but if you took them off she fired right up. Put the jumper cables back on and the truck died. The alternator wasn't hooked up at all while doing this.
 
Is anybody able to give me a wiring diagram for 2005 Chevy silverado 3500 6.6 lly .just looking for the engine wiring trying to trace short down thanks
 
tryn2 said:
Yes the other vehicle was running. The engine on the duramax wouldn't start with the jumper cables on it, but if you took them off she fired right up. Put the jumper cables back on and the truck died. The alternator wasn't hooked up at all while doing this.
Click to expand...

This info would have been useful earlier. :rolleyes5:

A wiring diagram is not useful. You don't know what wires you need to deal with...

Here is the issue: 1volt going from 12.6v to 13.5v is killing the engine. This has got to be a voltage sensitive arcing. 1 volt doesn't make sense on 12v wiring. It's possible just not likely.

What is likely is the high voltage system to drive the injectors has something arching over as one volt is multiplied several times to drive the injectors. This higher voltage is allowing a worn wire or bad component to arc over and shutdown the injector high voltage electronics.

So I would start by checking the wire loom coming from the fuel injector driver going to the injectors. Look by the alternator for several spots the harness is known to wear through. Also look at the wiring harness by the big engine connector plug as they rub there as well. Last I have seen the harness rub/burn through by the intercooler tube driver's side.

Next things to suspect are connections at the injectors, injectors, and the Injector driver module that is fuel cooled. Likely it is a big issue as one injector would only take out 4 total injectors. It will run on 4 and sound like a 6.5...

Pull codes from the ECM: it will likely tell you what failed to stall the engine.
 
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