Quote:
Originally Posted by The Rocknrod
From another post of vettevette - "To test the gauge you should first use an ohmmeter and read between the two posts looking for 40 or so ohms (I got 37.4 ohms). Then run a positive 12 volt wire to the plus side of the gauge and then a ground to the negative side and you should get empty. You have to be sure the gauge body and the cluster are grounded as well (they are so very grounded). I can't tell from the pictures what is on the circuit board.
Here are the resistance values of the gauges on the 67/72 trucks."
Except I have a 64.
So tomorrow I will try this. and post what ohms I get.
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Okay so made the gauge swing the opposite way using the gauge terminals, test leads to power and ground. So
it now reads empty.
Next I ran a ground lead outside the truck from the sender ground to a ground buss (known ground) directly.
I ran a test lead from the sender to the gauge terminal directly. And a power lead to the 12V terminal to a known 12V source. This was all separate from the installed harness.
Still
stuck on empty, tank is half full. Although the gauge jumps a bit (just slightly) like it wants to work when it gets 12V.