Quote:
Originally Posted by mrwill17
The plug has 6 prongs with 5 wires and one prong that is empty. If it is grounding out before it reaches the gauge I can assume that I will have to check the wires from the plug to the gauge. Any tips on making it easier would help. Yes I do have a multi meter but I do not know enough to check wires if they are grounding out. Any help or tips to check the wires would be would great Thanks!!!!!!!
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The sender is a variable resistor in the ground side of the fuel gauge circuit. I think it's 90 Ohms max sweep.
Max resistance (90 Ohms) is Full and Minimum resistance (Shorted to ground or 0 ohms) is Empty.
An open circuit, bad ground or unplugged sender, will show way past Full @ 3 O'clock on the gauge. Your ground is good. You unplugged the sender at the tank valve and it behaved as expected so the pink wire up to the gauge is ok.
If the gauge always shows Empty there is a short to ground in the wiring, valve, or senders. I'd test everything starting at the valve.
I usually pull the bed back onto planks or timbers slipped over the bumper and frame to access the senders. Much easier than pulling a tank.
With a partial fill the sender stud to a good ground should read more than 0 and less than max ohms.
Here's the 87-91 R/V dual tank schematic complete with the electrical internals of the switches, valve, and senders. Ignore the fuel pump motors and their power feeds everything else should be the same on the 85.