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Green wire question


4GWagon

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Working on several wiring issues I believe I an induced another. Factory temp gauge and fuel gauge stopped working suddenly. Pulled the gauge cluster and found that previous owner had jumpererd the solid green wire to under the screw that holds the fuel and temp gauge in the cluster due to the printed circuit board being damaged near the connector. Question is, what am I looking for out of this green wire? The wire schematic has me thinking its +12V.

 

1971 510 Wagon

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Green is the switched power source that is connected to the temp and gas gauge voltage regulator. The output from the VR goes through the two meters and are grounded by the temp and gas sender units in the block and gas tank to complete the circuits. If your turn signals still work then the fuse is OK.

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When you say voltage regulator are you talking about the main voltage regulator under the hood? Turn signals work fine. I'm wandering now if what I did to fix the turn signals caused this. I should see +12 on the green wire pin in the circuit board connector correct?

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Green is the switched power source that is connected to the temp and gas gauge voltage regulator. The output from the VR goes through the two meters and are grounded by the temp and gas sender units in the block and gas tank to complete the circuits. If your turn signals still work then the fuse is OK.

The battery voltage can vary from just under 12 up to 14.8 volts, depending on alternator output at idle or revved up and having the heater, lights and wipers on. This 2 to 3 volt range would normally throw the temp and gas gauges off. At idle they would read lower.

 

To prevent this a small volt regulator is used to reduce the power at the gauges to a steady 8 volts.

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