Glow Plug Trouble 0 degree weather!!

[dMerre89]

so the ground that goes to the relay is the one that trips to shut off the glow plugs? What controls that? Computer?

 

[scoutman77]

when the computer trips the ground, it will turn on the glow plugs, and the time it is on is controlled by the temperature sensor, and barometric pressure sensor. I believe. when they are both hot, the relay is in a neutral state, when the ground is set, the relay will trip because thats what relays do!

 

[dMerre89]

so what would be making that wire hot? Im guessin its a short because its really dim with the test light.

 

[JLDickmon]

so what would be making that wire hot? Im guessin its a short because its really dim with the test light.

I'm guessin you got a case of high resistance... I was gonna bring my wiring diagram home and scan it in, but I be fergots...