I have a 1990 F450 7.3 and would like to know where the glow plug controller is located at on this vehicle?? And what would cause my wait to start light to only stay on for 1/2 second??

 

I believe the glow plug controller on that engine is in the center of the valley on the back of the engine. round thing sticking up with a big plug on the top of it. about where the distributor would be located on a small block chevy. And yes, a bad controller would cause the wait to start light to go off early, if it isnt letting the glow plugs cycle right.

 

Thanks for the info. I'll let you know if this fix's & solves my problem.

 

Mine is a 92 F350 7.3 and the controller is located just above the valve cover on the left bank if looking from head on.

 

I wired mine over to manual system and it works great

 

im having the same problem, with my 90 f350. if you figure it out let us know.

 

I own a 92 four door bronco that I had problem with the glows when I bought it after buying controller,glows,solenoid, I found out the main plugin had some melted wires so I fix them and the wiring was the original problem that I had with my

 

Well I finally got it fixed. I wired it over to a manual push button and works great now. Thanks for all the helpful replies.