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New Fuel Guage wiring

B

bayhollow

Member
I just received a new fuel guage for my massey ferguson 135. Can anyone tell me exactly how this one wires in. I have a one wire alternator on the tractor.
a177048.jpg
 
The B terminal connects to the power from the ignition switch. Should get voltage only when the ignition switch is on.

The T terminal connects to the wire from the sending unit in the tank.

The terminal in the center of the black appears to be the light. It would connect to the light switch, it is optional and will not effect the operation of the gauge.

The gauge case (the upside down Christmas tree) needs to be grounded to the chassis. It will probably ground through contact with the dash as long as the surface is clean and the bracket tight.

Also the fuel tank and sending unit case need to be grounded for the gauge to work.
 
Thanks, I wired it like you said and nothing. I pulled the sender out of the tank and when I pick the float up (full) the guage shows empty. When I let the float down (empty) the guage shows full. The guage reads backward. Any suggestions?
 
(quoted from post at 11:35:51 11/03/17) Thanks, I wired it like you said and nothing. I pulled the sender out of the tank and when I pick the float up (full) the guage shows empty. When I let the float down (empty) the guage shows full. The guage reads backward. Any suggestions?
Click to expand...
he gauge and sender must match. Your do not.
 
Sounds like the gauge and sending unit are not compatible.

Fuel gauges operate on the basis of the resistance to ground of the terminal that connects to the sending unit.

"Most" sending units operate on the basis of:
Less resistance = full reading.
High resistance = empty reading.

Try this, disconnect the wire from the sending unit, ground the wire and see what the gauge does. Typically it will move to the full position. Disconnect the wire from ground and the gauge will drop to empty.

Once you have that information, you can contact the place where you bought the gauge, tell them what is happening. They may offer a different gauge or sending unit that is compatible.
 
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