crewchief219
Full Access Member
Stumped.. when i bought my truck (92 F250 7.3 IDI) the glow plugs didn't work at all. I replaced all 8 glow plugs with motorcraft, then replaced the controller. In the process I noticed that the ground for the old controller was never hooked up. I finished installing the new controller and it worked great.. so i thought.. well a week later it stopped working so I thought I got a bad controller. I ordered a motorcraft controller and a glow plug wiring harness from an international parts dealer. I replaced both and they worked again but noticed the harness connector below the power steering pump smoking! So after a little looking around I realize it's the two (yellow) glow plug power wires getting really hot. The wiring harness I installed only replaces the wires and fuses going from the controller to the glow plugs, nothing else. So the wires getting hot were never changed.
Here's some additional info.. When i noticed the ground wire for the old controller wasn't hooked up, I also couldn't find where it was supposed to be hooked up.. I wired it to a ground using the same gauge wire (added about 8 inches of wire) Could that be my problem? Where's it supposed to ground?
Also, it's getting hot right out of the fuse box, the closer to the fuses, the hotter the wire is. When I disconnected the harness where it was smoking I noticed a bunch of electrical tape and evidence that this had probably happened before. I'm thinking that's why the ground on the controller wasn't hooked up... just sold it like that.
That's all I can think of at the moment.. STUMPED.
Here's some additional info.. When i noticed the ground wire for the old controller wasn't hooked up, I also couldn't find where it was supposed to be hooked up.. I wired it to a ground using the same gauge wire (added about 8 inches of wire) Could that be my problem? Where's it supposed to ground?
Also, it's getting hot right out of the fuse box, the closer to the fuses, the hotter the wire is. When I disconnected the harness where it was smoking I noticed a bunch of electrical tape and evidence that this had probably happened before. I'm thinking that's why the ground on the controller wasn't hooked up... just sold it like that.
That's all I can think of at the moment.. STUMPED.
Last edited: