The Stovebolt Site Forums The Shop Area The Electrical Bay Wiring harness/fuel gauge question

Hello!

I had an earlier post asking about routing the fuel gauge wire, and the response was that it's part of the factory harness. Here's the issue -

The wiring in the truck appears to be pretty hacked up. I haven't gone through it yet, but when I removed the gas tank, there was a wire coming off the sending unit, going through a hole in the floor, and dangling under the truck, and there was a big wad of electrical tape on the end. I have a new gas tank/sending unit/hardware on the way, and I need to know where to look for the other end of the wire, asssuming it hasn't been completely pulled out of the harness...does the harness go under the cab along the frame rail, or ?. Hopefully I can reconnect the sending unit.

The gauge appears to work because when you turn on the key, it pegs to full, which probably means that it's grounded somewhere.

Thanks...

Chris

Mine was in a similar condition. Yes, the sending wire runs under the cab through that hole in the floor, joins the harness and goes to the gauge on the "F" side (at least mine did). The "E" side went back to the On side of the ignition switch.

My original harness had a ground location down there as well, didn't seem like a good place for a ground so I moved mine when I put in the new harness. I'll try to take a pic for you.

I think that the gauge will peg "Full" if the ground is removed, could be confused about that though.

Good luck!

there's a harness section that comes out of the firewall near the regulator and heads straight down underfoot - the brake switch wires come out of it - then it runs along the frame - under the driver there's some connectors for the rear lights - the sender wire comes off there .... an ohmmeter will be your friend, and it sounds like a complete new harness might be in order

Bill

Hy Barsteel, I believe the wire for the fuel gauge sending unit is a 20 ga. brown wire, if you can find it in the bundle of wires which run down the frame rail, hope that helps.

Update - I crawled under the truck to start poking around. Looks like someone has already replaced part of the wiring harness. The wire is housed in black plastic corrugated loom, the kind with the split up the center. There's 4 wires, one labelled "left signal", "right signal", "running light" and one that is labelled "fuel gauge", so mystery solved, at least for the time being.

Any idea what color the brake light wire is supposed to be?

Chris

Hy Barsteel, the original brake light wire for a truck without turn signals was what they call "20ga. natural white". However your truck does have turn signals, so your brake light wires are now labelled "left signal", and "right signal", the turn signal and brake light use the same filament in the bulb, hope that helps.