Fairly certain there is a Gremlin in my wiring

[g-71]

So, my fuel gauge has never worked the whole 25 + years I have owned the Bronco. Decided I would spend the time to get this fuel gauge working, searched tech articles on this forum, thought I had a pretty good idea of how to trouble shoot the issue. Tested this and that came to the conclusion I needed a new fuel gauge. Went to parts store bought a universal fuel gauge to use until the budget warranted a instument cluster rebuild. I put everything back together, wired up the new fuel gauge.......NOTHING..... Put the wire from the sending unit back on the fuel gauge in the original cluster, Turn the parking lights on, the turn signal lights in the cluster flash faintly, and the original fuel gauge works ???? Take the Bronco for a short shake down run, turn signals start working, fuel gauge stops working ???? WTH ???? Any suggestion would be GREATLY appreciated

Mike

 

[Viperwolf1]

Sounds like you may have a ground problem at the cluster. How are the oil pressure and temp gauges working? Do they read abnormally high or low? Do you have a tank selector switch on the dash?

 

[B RON CO]

Hi, X2 grounds. Check your fuel tank sender ground. 1 or 2 tanks?. Do you have a pulsing current at the tank sender wire? Your test light will be dim because the sender current is under 6 volts. I have 2 extra speedometer clusters, so when it was time to fix my non working fuel gauge I said I can make one out of three for sure. After trying the other two fuel gauges with no luck I realized the temp gauge would bolt in place and it works! Now when my tank is full it is on H, and when it goes to 120 I need gas. Good luck

 

[g-71]

Viperwolf, the temp, and oil pressure gauges work fine. When the turn signal lights were dimly pulsing and I switched from main tank to aux, the gauge would go to empty (the aux tank has been removed)

Mike

 

[Viperwolf1]

The tank switch can cause continuity problems occasionally. I recommend bypassing it since you don't have the aux tank. It's easy to do, just pull the wires off the back and connect the two orange ones together.