Thread: help needed - how to wire in a new fuel sender

Hi all

Getting close to having my 1976 109 truck cab (petrol) ready for roadworthy. Just a few electrical dramas to tidy up. My new fuel sender has 3 connections - an earth lug and then two terminals - one I am guessing is for the gauge and the other I am guessing is for a low level light.

The old sender only had a green wire to it.

Does anyone know how these two terminals get connected back to the gauge? Is it through a ballast resistor that I can see mounted on the bulk head (with nothing currently attached)?

thanks heaps

My guess is that three leads = Low level light included. One is the earth, one is the sender and the third triggers the low fuel light. Put a multi meter set to measure resistance across the earth lead (usually connected to the body of the unit) and one of the others. If it shows variable resistance across the entire movement of the float arm, then that is the sender lug. If it shows open circuit with the arm up until the arm gets fairly low, then goes closed circuit, then it is the low fuel light (which you can ignore as you don't have a low level light in your dash). They probably made them to suit both types.

Coop