Posted by rasman57 on January 06, 2011 at 19:27:28 from (67.142.167.21):
So you guys have never steered me wrong on the wizardry required to deal with the electrons....looking for advice on how to troubleshoot this. I get a new gas gauge for my 69 Case 580 12 volt negative ground with an keyed ignition. The tank sending unit has a single wire in the center and the ground wire mounted to the frame. The new gas gauge ordered from the Case dealer has 3 terminals; one marked S (sender?) one marked I (ignition?) and a G (ground).
So, being a product of a public school, I connect the wire from the sending unit to S, a wire from the ignition terminal of the switch to I. and ground wire to the G. Turn the key and bingo it pegs the gauge past full.....problem is that the tank is only 1/4 to 1/2 full. No instructions or diagram so I am convinced it is so simple as the gauge is already marked but maybe not.
The sending unit with float looks good but I do not know how to determine if it actually works. I assume the float mechanism acts on a metal strip creating a varied resistance out the sole wire which in turn would be reflected in the voltage through the gauge? Is there a method to test the sending unit? I also tried hooking up a small 6 volt battery to the gas gauge thinking reduced voltage would perhaps only show 1/2 full? Wrong.... it still pegged past full with 6 volts? So now I have exhausted my "sparkie" abilities and hope you can explain how this style of gauge actually works in theory and how to test a sending unit. Then I can do some troubleshooting I hope.
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