fuse in gloves box

[Jfromtn]

anyone know if any of the fuses in the glove box of 71 bronco has any thing to do with fuel gauge not working. have one fuse that is notworking so just wondering if this could be cause other than sender and wire .jason

 

[oleguy74]

no fuse.if oil and temp are ok,then you have other issues.they work off of the insterment voltage regulator or IVR as it is sometimes called.

 

[Viperwolf1]

The fuses have nothing to do with the gauges.

Ground the sender wire at the tank and see if it pegs the gauge. If it does the problem is either the sender or the ground opposite the sender wire.

Sender has between 10-73 ohms of resistance based on the fuel level. 10 ohms full. 73 ohms empty.

 

[oleguy74]

there is a web site you can go to and get wiring diagrams for 66-77 broncos.
seabiscuit68.tripod.com/details

 

[Jfromtn]

when you talk about ground at tank, do you mean take the ground wire and put it on one of the two prongs on the sending unit

 

[oleguy74]

take a piece of wire 2 feet long and put aligator clips on each end.remove plug from sender,connect one end to black wire and other end to orange wire(this is for rear tank)turn ign key to acc,gauge should go to full.repeate for aux tank.aux gauge wire is yellow/white.also set tank sw on dash to tank being tested.if gauge goes to full turn ign sw off so you don't dammage gauge.get another wire with allagator clips,connect a 10 ohm resistor between the two wires and repeat.with 10 ohms gauge should read full.replace 10 ohm res with a 73 ohm and gauge should read empty.

 

[Jfromtn]

thanks alot