New member to the diesel stop.
Last week my glow plug relay went out. Third relay in 2 years. Read about people installing the heavy duty Stancor as a replacement. Well I wanted to get the truck back up and running did not want to order the Stancor and wait for it to show up. In my search for a replacement I decided to try a solenoid from Napa, part #st36 Store Locator | NAPA Online
Hooked everyting up last Thursday night and the truck starts great on Friday. I left the truck sit for 4 days (away on business trip) and when I return the batteries are dead. I hook up the battery charger for 2 hours and try to start. No wait to start light. I start checking for blown fuses. Not a single blown fuse inside cab or under hood. Start swapping out relays and still no wait to start light. I use my MCSP to read codes and there are none.
Next step was to check at the GPR itself and discover that my ground wire from PCM is hot. So now I have 3 hot lines at the GPR reading 12 volts. I decide to unhook bothe small wire at GPR and my wait to start light comes on when I turn the key. I decide to hook up the small wire from the ignition and then used jumper cables to supply juice to th glow plugs. The truck starts up and all is fine.
Can someone explain why my ground wire from Pcm was hot and why the wait to start light was not working?
Sorry for the long post, but this one has me stumped.