Posted by John T on May 11, 2021 at 05:21:26 from (45.16.200.171):
In Reply to: Gas Guage Again posted by super99 on May 10, 2021 at 17:43:34:
If turning the power on to the gauges input causes full needle deflection and that's so regardless of tank level, that makes me believe the sending unit IS THE WRONG RESISTANCE, it doesn't match the gauge. The sending units resistance must be matched for the gauge BUT I CANT TELL YOU the proper sending unit to match your gauge.
ALSO if the wire and circuit from gauge output to sender were shorted out somewhere that might cause full deflection, insure there are no shorts in the gauge itself or the wire from it to sender. However if the gauge had its own internal faulty short to ground, it would deflect even if no sender was attached. Id say its more likely a sender versus a shorted gauge problem.
Full needle deflection makes me believe you have adequate voltage on the gauges input plus there's a good ground (circuit from gauges output to and through sender to ground). IE its if there were NO deflection Id suspect a bad/missing ground connection, but full deflection makes me think the ground is okay.
If you remove the sending unit but have everything wired up correct including a good ground return for the sender and turn power on holding the sender mount horizontal, the gauge (if sender is right resistance) should swing from full to empty IF ITS THE RIGHT RESISTANCE
If worse comes to worse one possible solution is to buy a whole new gauge with sensor package.
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