Fuel Gauge stopped working
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Mountain Pass
Joined: Jul 2025
Posts: 132
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Fuel Gauge stopped working
I removed instrument cluster from my 1966 F100 Custom Cab in order to replace bezel and lens. Fuel gauge worked before removing but now does not work after reinstalling cluster. I grounded the orange wire going to the sending unit/ float assembly and gauge did not move. I removed instrument cluster voltage regulator, gave it a little shake and could hear something rattle inside it. I ordered a new regulator from Dennis Carpenter and installed. Gauge still not working. I have previously replaced sending unit/float assembly. I grounded the terminal for the orange wire on the back of the gauge, gauge did not move. What kind of reading should I be getting on the orange wire at the fuel tank sending unit/float assembly? Are there any other tests to try before ordering a new gauge? Thanks.
Edit: With test light I have power on 1 side of regulator, gets hot to the touch. At orange wire to the sending unit test light will not light up. Ohms tested sending unit. With out touching sending unit, meter reads OL. When touching sending unit meter reads 0.0. The Dennis Carpenter regulator has female terminal on the left, male on the right. Original regulator was opposite, female on right. male on left. Would that make a difference?
Edit: With test light I have power on 1 side of regulator, gets hot to the touch. At orange wire to the sending unit test light will not light up. Ohms tested sending unit. With out touching sending unit, meter reads OL. When touching sending unit meter reads 0.0. The Dennis Carpenter regulator has female terminal on the left, male on the right. Original regulator was opposite, female on right. male on left. Would that make a difference?
Last edited by 66Classic96; Yesterday at 05:33 PM. Reason: more info
Logistics Pro
Joined: May 2015
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From: Tri Cities, TN
Here is an old thread to read it might help you figure out the problem. Fuel gauge issue - Ford Truck Enthusiasts Forums
FTE Legend
Joined: Jun 2004
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From: Upstate NY
I removed instrument cluster from my 1966 F100 Custom Cab in order to replace bezel and lens. Fuel gauge worked before removing but now does not work after reinstalling cluster. I grounded the orange wire going to the sending unit/ float assembly and gauge did not move. I removed instrument cluster voltage regulator, gave it a little shake and could hear something rattle inside it. I ordered a new regulator from Dennis Carpenter and installed. Gauge still not working. I have previously replaced sending unit/float assembly. I grounded the terminal for the orange wire on the back of the gauge, gauge did not move. What kind of reading should I be getting on the orange wire at the fuel tank sending unit/float assembly? Are there any other tests to try before ordering a new gauge? Thanks.
Edit: With test light I have power on 1 side of regulator, gets hot to the touch. At orange wire to the sending unit test light will not light up. Ohms tested sending unit. With out touching sending unit, meter reads OL. When touching sending unit meter reads 0.0. The Dennis Carpenter regulator has female terminal on the left, male on the right. Original regulator was opposite, female on right. male on left. Would that make a difference?
Edit: With test light I have power on 1 side of regulator, gets hot to the touch. At orange wire to the sending unit test light will not light up. Ohms tested sending unit. With out touching sending unit, meter reads OL. When touching sending unit meter reads 0.0. The Dennis Carpenter regulator has female terminal on the left, male on the right. Original regulator was opposite, female on right. male on left. Would that make a difference?
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