Volt gauge wiring

[rcb]

Happy New Year to All !!!
Need help with M1028 volt gauge wiring... volt gauge needle does not move
when the ignition is turned on, in fact it never moves. I see that there are 2 wires going to the volt gauge, black and orange. The orange wire is always hot but I'm not sure what the black wire is for ?? I can't seem to trace the black wire anywhere. The test light will not come on when I put the tester between the orange and black wires. So, obviously the black is not grounding. Can anyone
tell me where the black wire goes ??
Thanks...
Bob

 

[SmokeyDod]

Take something and just tap "lightly" the face of the guage. Sometimes the needle hand just "stick" and jaring it a little will free it. My son's M1028 does this and for 4 years this is what he does if he wants to see it work. Just a simple check. Probably might not be your issue but you won't know until you try it. Good Luck.

 

[dependable]

There is a ground point for the 24v part of the dash wireing harness. It is a 6 prong ground terminal way up left under the dash, it is 6 or 8 inches away from the blackout switch. There should be one black wire hooked to it.

 

[twright]

Check the Relay it is under the dash on a bracket here is the wiring for the CUCV not for 1010 all others

 

[Crash_AF]

The ground runs through one of the two black cube relays under the dash below where the stereo would be. One controls the voltmeter and the other controls the Gen 2 circuit. They are right beside the silver starter solenoid relay.

As a temporary check, you can swap the relays to see if the Voltmeter works. And if the Gen 2 doesn't work, the relay is probably bad. You can get the relays from any parts store. They are a standard Bosch relay that is used in many automotive applications. You can ask for an Air Conditioner relay for a 1989 Jeep Cherokee to get one that will work. If it has the little mounting tab molded into the top of it, just break it off.

Later,
Joe