Mercury 2008 fuel gauge no power ?

[304]

Not sure what I’ve done , recently purchased a boat with Mercury 75 2 stroke . The instrument cluster was all working fine but the wiring was very untidy , a fuse was blowing in the engine as well and I was told it might have been an auxiliary circuit which was doing that .After tidying wiring up fuel gauge not working , Am I correct in Saying that there should be a supply to gauge and the cable to sender is a variable earth so to speak ? I put a meter to gauge with ignition on and didn’t get any voltage so was wondering where the power comes from ,is it from engine loom or from ignition switch , also the cut off switch not operating, any ideas . Many thanks

 

[spannerman]

Yes that is how the gauge works, the power comes from the ignition switch and the purple wire is the power supply to all gauges, there should be a black earth wire on the gauge also. They are marked + - and S on the gauge, S going to the tank sender. By cut off I assume you mean dead man switch, this has two black with yellow stripe wires which go from the B/Y on the ignition switch up to the dead man switch then back into the same colour wire on the harness going to the engine.

 

[304]

That’s great I will have check supply from ignition , now know how that cut off works it all seems to do with the ignition switch , Thanks again for your speedy response and advice ,

 

[304]

Yes that is how the gauge works, the power comes from the ignition switch and the purple wire is the power supply to all gauges, there should be a black earth wire on the gauge also. They are marked + - and S on the gauge, S going to the tank sender. By cut off I assume you mean dead man switch, this has two black with yellow stripe wires which go from the B/Y on the ignition switch up to the dead man switch then back into the same colour wire on the harness going to the engine.

That’s great thanks for your response and advice , I will check ignition switch