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Anybody good at trouble shooting electrical?

1281 Views 7 Replies 4 Participants Last post by  Etch32
Hey, posted a thread the other day about all kinds of problems. Well today I put a different PCM in the truck and would you believe it, the thing cranks over. I cranked it for about 5 or 6 seconds and stopped, then I go to crank it again and nothing. But the only light in the dash that stays on now is the check engine light, plus no more tbc fault. So I start trying to trouble shoot the starting circuit and come to find I'm getting power to the starter relay but from there it's not getting to the smaller wire going to the starter. So I change relays but nothing seems to work. So me being the genius that I am make a jumper to go from the hot coming from battery to the fuse box and touch it to the wire going down to the starter. Truck cranks over for like a second, then goes hay wire. Now you turn the key to the on position and all the lights flicker in the dash, almost acts like low voltage or bad connection, but batteries read 12 volts and I can't see any bad connections. I don't know, just getting frustrated. Anybody have any idea's. Could really use the help. Thanks
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Well turns out my batteries were just bad. Put to new batteries in today and turns over great. It kinda acted like it wanted to run but would'nt. Going to try and see if I have air in the fuel lines or something. Also OT, code number matched but not sure on the program. I was worried about that but with the new pcm no more TBC fault, wrench light or abs light and it turns over at least. Thanks guys.
OT, not sure if you read my other thread I started but in that I mentioned that I bought this truck at a auction, it was a recovered theft. Well turns out the manager at the local parts store were I live some how know's the guy who stole the truck. He was able to find out a little info on the truck for me and found that the pcm was fried. So after replacing that and putting new batteries in at least I've got her cranking now. Hope to have her running after tomorrow. Take care.
Ya, I'm wasn't looking for a specific answer, just trying to get some idea's on what to try. Seems like a lot of guys here know what there taking about and I figured it wouldn't hurt to get some idea's.
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