rear light wiring
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,172
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From: S/W Missouri, Polk county
Not sure about your volts, but you can use a piece of wood/old broom handle (cut to the correct length) to hold the brake pedal down. Wedge it between the pedal and the front bottom edge of the seat. Or use a cement block/paver to hold it. Got a junk mirror, put it on the shop back wall to see if the lights are working.
Get a inspection mirror with a magnet base.
Get a inspection mirror with a magnet base.
Laughing Gas
Joined: Jan 2014
Posts: 1,077
Likes: 500
From: Kenai
You should be ssing nominal battery voltage on all your light wires. 1.2V indicates a bad wire (ie-connector or corrosion)
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More Turbo
Joined: Mar 2022
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I may need to run all new wires from the fuse box to the rear. The original look seems to be intact/wrapped but I guess it doesn't mean there isn't an area of corrosion somewhere.
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More Turbo
Joined: Mar 2022
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no power at wires
ok. had a bit of time to cont investigating my lack of rear lights. I tried using a multimeter tool to measure voltage across the individual fuse terminals. I'm not sure if I'm using the tool correctly, I have it set to volts, and on DC but I'm not getting consistent reads. measuring across the battery terminals, I'm getting around 12.5v. at times, when I try measuring across the terminals for the rear light fuse, I see 11.6-11.7v but it's not consistent. I grabbed one of the cheapo voltage checkers that lights up from Amazon and am getting a consistent 11.6-7v across all the fuses w/ key on, before and after the fuses.
This tells me that fuse box is at least working, and I need to learn how to use the multimeter tool a bit better.
When i touch the rear harness wires, I'm not getting anything close to 11-12v, mostly some low voltage measure in mV. Should I be getting the 11.6v that I'm seeing from the fuse box? I assume that I should be.
I guess I'll start cutting into the harness and see if there's a short circuit, any crumbling wire insulation, etc.
At least I know the problem is somewhere in the wiring between the fuse box and the rear of the truck, right?
This tells me that fuse box is at least working, and I need to learn how to use the multimeter tool a bit better.
When i touch the rear harness wires, I'm not getting anything close to 11-12v, mostly some low voltage measure in mV. Should I be getting the 11.6v that I'm seeing from the fuse box? I assume that I should be.
I guess I'll start cutting into the harness and see if there's a short circuit, any crumbling wire insulation, etc.
At least I know the problem is somewhere in the wiring between the fuse box and the rear of the truck, right?
Mountain Pass
Joined: Jul 2017
Posts: 229
Likes: 27
Yes, it should be nearly the same as you are getting at the fuse box. To be honest, the simplest way to fix this might be to run a new wire from the brake pedal to back. At the very least, you can put a plug connector on at the light, and run a new wire, plug it in and see if it works. If it doesn't, you can plug it back into the original harness.
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