110 fuel gauge not working?

davidmayo · Oct 25, 2013

I have just rebuilt the truck and fuel guage worked fine before.
Basically I can't get the guage to read a thing.

If I ground the green and black wire that goes to the tank then the guage reads full but nothing when attached to the tank.

I have tested the tank and it has a good earth as does the second wire (black)

The actual guage has full battery power going in and about half the power going out (green/black wire), which I understand to be correct as its like a resistor but not sure?

Station House · Oct 25, 2013

Sounds like you've eliminated everything except the sender itself

Oldseadog · Oct 25, 2013

Do you have two terminals on the sender unit along with the earth ... three in total.

The black wire goes to earth.

Have you connected the green/black to the right terminal?

Do you have a white/slate wire?

If you have, then change them over, as the green/black is for the fuel level and the white/slate is for the low fuel indicator lamp.

davidmayo · Oct 25, 2013

Sender unit is fine, I know this cuz was working fine before i rebuilt it.

On the sender unit is 2 spade terminals one has a red surround and one has a white surround. Red one is the rh one.

I have tried both combinations but I am assuming that the green/black one is supposed to go on the rh red one, and the black wire to the lh spade.

The is also what looks like an m5 stud sticking out of the sender?

If you follow the two wires from
The sender unit back to the round plug, there is 4 wires going into the plug but the other two are blanked off with little red caps. I'm assuming just a universal loom?

Carrington224 · Oct 25, 2013

My fuel gauge was working fine and just stopped, reading empty. It was the wire between float arm and resistor, just soldered a new wire on and it's fine again.

mrchurchill109 · Oct 25, 2013

"Worked when I took it apart" but not now is a notorious Landy characteristic.

What I would do if I were you is put an ohm-meter on the sender output terminal to ground and see if you read anyting at all. IIRC resistance value is 33 to 330 ohms or something like...not that that particularly matters. If you read nothing at all or a very high resistance i'd suspect the sender's gone defective.

Kwakerman · Oct 25, 2013

Got any fuel in the tank?

110 fuel gauge not working?

davidmayo

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Station House

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Oldseadog

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davidmayo

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Carrington224

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mrchurchill109

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Kwakerman

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