With most gauges the sending unit grounds the wire going to the gauge. It sending unit varies the resistance to ground and that's how it makes the gauge needle go up or down. The higher the float is in the tank, the more resistance the sender makes and the higher the gauge goes. Remove the wire from the sender and see what the gauge does. If the gauge goes to empty with the wire off the sender the sender is shorted out. If you touch the wire to a ground it should peg the gauge. If the gauge still pegs with the wire off the sender the wire might possibly be shorted somewhere between the sender and gauge. If the wire to the sender is good, someone else on this forum is gonna have to help you out. Jim
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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