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'51 Desoto gas gauge


Tim Larson

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Gas gauges have always been the bane of my existence, it seems. 

 

The gas gauge on my neighbor's '51 Desoto is not working. What is the best way to start troubleshooting this? The car is still 6 volt. Is there a way to test the gauge? I know grounding is very important - especially on 6 volt cars.

 

I appreciate any suggestion!

Edited by tjlarson88
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You will need an adjustable variable 1-100 ohm resistor.  Find the wire hooked to the sending unit.  Disconnect it and insert the VR between the the end of the sending wire and ground.  Turn on the ign switch and have someone watch the gas gauge while the resistance is varied.  Needle does not move= bad gauge or wiring.  Needle moves= bad in tank sender.  

 

This is just one test but is the one I use.

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