Possibly bad GPR?
Hey guys, I think my GPR is done. Some info, 2002 f250, 7.3, 250k. This is to my knowledge the original GPR in this truck. I decided to install one of those leds like some guys are doing to let you know when the glow plugs are done heating. After hooking everything up I turned the switch on and no light. If I put a jumper wire from the battery to the side of the GPR the light is hooked to, drivers side large post, the led inside lights up bright. Otherwise nothing. I thinking my GPR is bad? It doesn't kind of drag on really cold mornings. Any help is appreciated!