Posted by Steve@Advance on July 26, 2014 at 11:24:42 from (108.245.66.82):
In Reply to: JD 970 fuel gauge posted by Tony Tee. on July 26, 2014 at 09:49:11:
Need to test the circuit to find the problem.
First, give it a visual inspection, look for pinched, chewed, cut wires. Be sure the tank and sending unit are grounded to the chassis.
Disconnect the wire from the sending unit, see if the gauge falls to empty. If it does, the problem is in the sending unit.
If it stays on full with the wire disconnected, ground the wire and see if the gauge goes to empty. (Some work backward, just need to check to be sure.) If it does, the problem is in the sender.
If removing and/or grounding the wire make no difference, go to the back of the gauge and remove the sending unit wire (Not the power wire). If the gauge falls to empty, the wire is shorted to ground somewhere.
If it stays on full with the wire disconnected, the gauge itself is bad.
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