Quote:
Originally Posted by LM44S
The gauges read full and according to the manufacturer of the sending unit that indicates a break in the wire to the unit.
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You were given incorrect information. Some gauges work that way. My '58 Chevy works that way. But on all four old Ford gauges, if connection to the sensor is broken, needle moves to worse-case position. Fuel gauge needle moves to E.
When you ran a jumper wire to the sender, was the original sender wire disconnected at both ends? One thing that could explain needle always on F is a short to ground somewhere along the sender wire. That could also explain your low voltage reading on the gauge sender terminal, cuz voltage is dumping to ground.