ok so i got a 1986 ford f250 6.9 idi and when i go to start it in the morning the glow plug will stay on for 5 to 10 seconds then go off.....then it will start flashing???? and be hella hard to start ???? any suggestions wear to start with that ???????

 

glow plug controller is gone. buy a manual and change it out or look up how to wire in a push botton set up

 

a manual glow plug conrtrol????

 

I've got a '87 6.9 and I had the same exact prob a few months back. Your glow plug controller is bad. I made the mistake of just replacing the relay first; Still wouldn't work. When you buy a controller, it comes with a new relay already mounted on it. Swap that out and you should be good to go. I had a fella on line help me intellidog.com/dieselmann/ if I remember right. The guy is super knowledgable of Ford diesels.

 

well my conrtoller looks new....but who knows...thx

 

I put a horn button in the dash of mine and wired to that, just hold it in for a bit. dont have to worry about a controller after that