think i might have found the problem. looks like the wiring harness on the pas side fell on the exhaust manifold. the wire are melted together. i need to fix that and see what happens.

 

so i know it's been a while, i had to step away for some time. So i have fixed all the broken wires, basically i replaced the whole glow plug circuit. Still nothing has changed.

What is all comes down to is the computer is not sending power to the relay to turn it on. I have power on the big stud, on the wiring clip i have power to the pink wire, and ground on the black, but no power on the yellow wire from the computer.

 

bad ecm?

 

that is what i am thinking, but would that cause it to randomly work and not work?

 

i had the same problems. i got a ECM from autozone for 94 bucks. Mine would run sometimes and sometimes wouldnt. i could tell when it would run by if the glow plug light came on. NO LIGHT NO RUN. is how mine was. the other problem i had was the plug going into the ECM closest to the glove box had a few loose wires. if i touched them it would die. Got that fixed and have had no problems since

 

so your problem was really both? bad ecm and loose wires?

 

Yep pretty much. I had to take some of the little wires out of the plug and smash the ends back shut si the would get a good conection

 

Well i spoke to soon. After i replaced my ECM i didnt have a single problem with my truck for 8 months. Now i am back to the same problem you are having and the same problem i started with. My ECM was under warranty so i took it back and got a brand new one. Still didnt fix it. Truck runs great when it starts. But if now glow plug liget no start and i also replaced the glow plug relay this weekend and starts sometimes and sometimes nothing.

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I have a few minutes I will give you a little history on my truck and my issues. I have a 1995 6.5TD. I got it because the old owner couldn’t get it running. The issue they had was if the glow plug light didn’t come on it wouldn’t start. Some days it would start and run fine and others it wouldn’t. I got the truck after they put a new LP, IP, Glow Plug relay, PMD. And so on they spend a ton of money at the local diesel shop and didn’t get too far. So I picked the truck up dirt cheap. I went over everything that was already done and cleaned all the grounds and still start sometimes others wouldn’t. I repaired wires and all kind of stuff like that. So I put a new ECM in it the truck started right up and didn’t have a single problem with it for 8 months. Now it is back to doing the same thing. The ECM was under warranty so I took it back and got a new one. After trying to start it I got a code for the glow plug relay so I replaced it and the truck started up and ran great. Well this morning it wouldn’t start again. The thing I noticed was when I turn the key if I don’t get the glow plug light the truck won’t start. And if I don’t get a glow plug like I can’t get any codes because it won’t read the computer. I am just as lost as Whitgit. So if you (whitgit) figure anything out let me know and I will do the same. It sounds like we have the same problem right to a TEE.

 

how about the other gauges on the dash do they still work when have no glow plug like

 

Yep all the other gauges work fine. I think it has to be a bad wire some where. At lunch i wiggles the wires on the drives side where they come thur the fire wall it it started right up. I dont know if this means thats where i shoudl start looking or if it is just one of the times it wants to start