i have a 1995 chevy 6.5. It was always a good running truck. Started having problems with it so fuel system was redone. And ran fine for a while. Then it go tto where it wouldnt start. the wait light would just flashe real fast then off. Didnt matter if hot or cold out wouldnt start. So i replaced the glow plugs. Same thing sometimes would start sometimes wouldnt. Then it would start but sometimes it would shut off at random and wouldnt start again. Soi got a glow plug relay and it started right up and ran fine for a day and a half then wont start again. Someone said to clean the grounds so i did and didnt help. Someone else said to jump the relay for 90 seconds and it should start didnt help. When i turn the key the relay just clicks and thats it. I tested the plug going to the relay with the key on and have power to the passenger side wire and ground to the drivers side and nothing to the middle wire.I figure the middle must be some kind os switched or something. I dont want to go buy another relay if there is something that will keep making them go bad or if the relay didnt fixe it and there is something that runs the relay making it do this. If someone could help it would be great thanks

 

Hmm.. Check wireing from the relay to the ECM and also from the ignition key. It is going to be a pain to do. If everything checks out. I belive you have software issues or ECM issues. For better information you might want to contact

They might direct you to somebody near you if it needs to go to a shop. they also write custome tunes for your truck