Quote:
Originally Posted by cleansquare
Thank u for the quick help. Between a and c I get nothing. Between b and c I get 124 ohms
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You're welcome. At this point, it sounds like the resistor on the back of your voltmeter is either bad or simply not making a good connection.
To rule out a bad connection, remove the 2 nuts and measure the resistor directly with your multimeter. If you still don't get any reading (open circuit), you'll have to replace the resistor. A few options for that include:
(1) Salvage a good used resistor off another 1976 - 1987(91) voltmeter. Or just use the whole voltmeter assembly if it has the faceplate style that matches the rest of your cluster. Note: the resistors on the other gauges are different.
(2) Napa offers some replacement resistors for GM gauges as part number NOE 7011498. But they don't give any details on the resistance so I'm not sure if they'd be suitable for your voltmeter or not.
(3) Buy a resistor from an electronic parts supplier. I measured the resistor on that voltmeter in the photo I posted ... it's 127.3Ω. The closest standard value resistor would be 130Ω and I don't think the slight difference would be noticeable. To install it, crimp on some ring terminals (like the Napa resistors) and use some nylon washers (or the old open-circuited ceramic resistor) as insulators between the the metal housing and the terminals. You want the resistor leads to make contact with the studs/nuts but not the metal housing on the back of the voltmeter.