Does anyone have available a simple wiring diagram for the instrument pod on a 1978 928? (I am mostly concerned with the wiring to the the 12 wire connectors)
(In particular the voltmeter and oil pressure gauge are non-functional)

The voltmeter has no response under any conditions and the oil gauge pegs it's self at the high end. (I disconnected the oil sender and then the wiring warning module - still pegs once the ignition goes on)

 

Before you go deep into serious troubleshooting, do yourself a favor and get under the pod with a flashlight and verify the connector did not slip off. Happened to me recently on the other side of the pod and happened once again, after I plugged it back in. I'll have to figure out a way to lock these connectors in because they are basically hanging upside-down and with aging, the walls of plastic housing have kind of bowed out, reducing the retention force they once had. If it checks out OK you have a more serious problem but I would start there.

 

Thanks for the input; however I did not mention the pod is out of the car now. It is not the contacts, it is in the wiring. Hence, the need for a wiring diagram of the of the three (12 wire) connectors to the instrument pod.

 

PM me with your email address and i'll send you the full 78 wiring diagrams as a pdf.

 

To NEIH

I hope I was able to PM you.

 

Diagrams emailed to you

 

Thank you!