Welcome and thank you for allowing me to assist you! Yes it is a ground wire and it connects to the left side of the dash area underneath near the parking brake pedal. It attach's to a stud or a screw.
Well Mark, I can certainly help you with this. Have you checked for power feeds to the cluster? Do you have a 12 volt test light to check that? If so, I will tell you which wires to check for power.
By the way, It is against just answer policy for me to contact you outside of the web site (sorry)
Ok Mark, it sounds like there is power AND ground if the lights come on. Try this for me: with the ignition off, press and hold the trip odometer reset button and then turn on the ignition to the run position, continue to hold the button for about 2 seconds then release the button. Let me know if the cluster goes through it's self test and sweeps all of the gauges.
Hmmm ok I guess we need to do that power and ground check. Pull the cluster out and check it for me. I will send you the connector pin out diagram in a bit.
Okj, here is the connector pin out. Let me know if you have power at the connector.
INSTRUMENT CLUSTERCAV CIRCUIT FUNCTION 1 - - 10 D1 20VT/BR CCD BUS (+) 11 F11 20RD/WT FUSED IGNITION SWITCH OUTPUT (OFF/RUN/START) 12 - - 13 Z1 20BK GROUND 2 M1 22PK FUSED B(+) 3 - - 4 - - 5 - - 6 E2 22OR PANEL LAMPS DRIVER 7 Z2 20BK/LG GROUND 8 - - 9 D2 20WT/BK CCD BUS (-)
No problem Mark, let me know when you get a chance. But what you will do is to ground the 12 volt test light, turn on the ignition, and then probe the #2 and #11 cavities in the connector. This should light the test light. To check the ground, stick a paper clip into the #7 and #13 terminals, and attach the test light's clip to the paper clip, then recheck the powers again. If the light powers up, then the grounds are ok.
You are welcome Mark! If you can, try to use the test light because it will put a little load on the circuit. A digital voltmeter will read voltage, but does not load the circuit. I want to see a nice and bright light when you test the circuits. Ask your teacher why I want you to use a light instead. He can explain it to you if needed.