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Hey Guys---
Last week I stopped by my godfathers before work. I came back out 45 mins later and tried starting my truck and had absolutely no juice. It hasnt been running since last tuesday cuz i havent had time to fix it.....I put brand new batteries in it and it started up and i got it home. I let it set wed nite and by thurs morn no power again. I unhooked the edge and it didnt do a bit of good. I called a GM dealer and one guy told me to pull the starter off and have it checked. He said they go into a safe mode and dont give the truck any power. Also said that diesels heat up and starters usually need to be replaced by 75K so im going to pull it and take it to a specialist. Any other ideas if my starter tests good? possibly a bad ground or something? Im so depressed that I have a $30K truck sitting in my driveway waxed and clean.....that WONT RUN!!! help!!!
 

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You might check your alternator as well as your starter. Aspecific issue with the alternator could cause it to consume electricity even when the switch off. Also, a "dead" cell in either battery could cause both batteries to go dead.

If neither one of these is an issue, you might try removing both negative cables from the battery, and installing a test light between each post and each removed cable cable, so that all electricity consumed by the vehicle must pass through the lights.

Make sure everything is turned off, including the dome light. remove the fuse for the clock/radio and the ecm fuse. Begin pulling and replacing fuses (the same fuse that was taken out) until the light on the test light goes dim(er) or goes out. When this happens, it may lead you to the circuit that is causing the discharge.

I am not farmiliar with the static current draw of these trucks, if the static draw is too high, you might need to use an amp meter (multimeter) in place of the test light to notice the draw, but the procedure is the same.

Once you narrow the draw to a single circuit, you can dive into the specific issue to resolve the problem.
 

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Dont sound like a starter to be possibley and alternator for sure but not a starter if your alternator is fine and starter is good its gotta be a ground
 

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and also make sure the ground cable to the starter is good
i replaced mine in a panic haveing to go to work in the morning and needing my truck
i replaced the starter and still nothing fineally ended up being a simple bad ground cable connection
 
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