4GWagon Posted October 26, 2014 Report Share Posted October 26, 2014 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 Quote Link to comment
heywier427 Posted October 26, 2014 Report Share Posted October 26, 2014 yea, looks like switched power. Quote Link to comment
datzenmike Posted October 26, 2014 Report Share Posted October 26, 2014 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. Quote Link to comment
4GWagon Posted October 27, 2014 Author Report Share Posted October 27, 2014 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? Quote Link to comment
banzai510(hainz) Posted October 28, 2014 Report Share Posted October 28, 2014 When you say voltage regulator are you talking about the main voltage regulator under the hood NO!!!!!!!!!! thats the VR for the dash. the little metal can thing. when this is bad or really loose most likely to will give bad readings to both. Quote Link to comment
datzenmike Posted October 28, 2014 Report Share Posted October 28, 2014 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. 1 Quote Link to comment
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