ok i bought a 95 cummins its got 174000 miles on it everything is nice its got alot done to it but for some reason the battery wont hold charge it confuses the hell out of me i bough 2 new batteries a new alternator and same prolem i am going to have the voltage regulator looked at is there anything else it could be?

 

does you tack work?

 

sounds like you have something draining them when the truck isnt running

 

well i talked to a guy in my local auto zone he said the emc he didnt test it or anything should i make him test it? its around 225 dollars so i dont want to but it and it not be the problem thanks for the help

 

Maybe try un hooking the batteries after you drive it. So the batteries couldnt power anything if they wanted to. If it stays charged when you hook them up to start it, then you know something is draining them. If they dont hold charge, its the batteries. That will at least save you some money so you can narrow it down.

 

true i can give it a try hoping it may just be a connection or something

 

a bad pcm ur main gauges wouldnt work.. rpm speedo... and your check engine light nor ur wait to start...

 

It could be the pcm. It wouldn't necessarily cause all of your gauges to not function. I had that same issue with my truck. My tach wouldn't work, nor my volt meter. After dealing with the dealership, who said my Crank sensor was shot then replacing that with no luck I swapped out my pcm for a new one, and everything was good.

 

Check you voltage requlator itll keep the truck from starting to and it doesnt work it wont let the alternator charge the batteries. Another way to test is to use a battery tester and run the truck and see where the voltage is sitting at it shoud be around 14 V to charge.

 

does it have an aftermarket stereo in it??? and did you or the guy you bought it from put it in? check your radio out. aftermarket gauge power hook ups pullin off a hot power instead of a key on power