Sudden electrical wierdness

[laffycaffi]

Suddenly my gas meter stopped working. My passenger tail light won’t turn off, my driver side brake light won’t work, unless I’ve turned my left turn signal on - that activates my drivers side brake light.

Any ideas?

[phyler]

With any electrical weirdness, start making sure your grounds are good. I'd look at a wiring diagram and see what all those have in common as well. Might be the plug under the hood right in front of the driver came a bit loose?

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[Viperwolf1]

The wiring harness going back along the frame has a problem. If you have exhaust running along the drivers side it's somewhat common to melt those wires.

[Kinder]

I’ll add that since you just did a bunch of exhaust work you may have jarred the wires and made an almost problem a real problem. Look along the harness from the firewall back and see if the wrap (electrical tape likely) looks nicked or otherwise damaged and start there.

[laffycaffi]

Here’s a video of the wiring along the frame. Not really sure what I’m looking for. Seems fine to me? https://youtu.be/3Xvg5lL3tgk

And here are some pics.

[laffycaffi]

Good news. I cleaned the grounds at the brake lights and problem solved! But the fuel meter still nothing.

[phyler]

Good news. I cleaned the grounds at the brake lights and problem solved! But the fuel meter still nothing.

Check the ground. [emoji16] It's back by the fuel tank. Easy for it to get crudded up. Had that happen on mine. Cleaned and my gas gauge has been consistent since.

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[Eck]

And fuel gauges only work in 30% of Broncos so don’t beat yourself up too much if it doesn’t work!!


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[phyler]

And fuel gauges only work in 30% of Broncos so don’t beat yourself up too much if it doesn’t work!!


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Too true. Most that do work are off by 1/4 tank as well (reading 3/4 when full).

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[Eck]

And fuel gauges only work in 30% of Broncos so don’t beat yourself up too much if it doesn’t work!!


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Too true. Most that do work are off by 1/4 tank as well (reading 3/4 when full).

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Guilty- and I replaced the wiring and sending unit.


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[laffycaffi]

Ha well that’s good to know. Did replacing the sending unit solve it for you?

[Eck]

Ha well that’s good to know. Did replacing the sending unit solve it for you?

Sort of. My old one did not work at all and so I replaced it with a new one. However-- even that one isn't accurate like modern vehicles. At FULL it shows about 3/4 fill and when I am on E-- I know I still have around 1/4 tank. So it works well enough to use it so I never get stranded...