So I'm doing troubleshooting for my dim tail lights. My meter indicates about 10.5 volts at the taillights. I think I know where the ground wire is, but not the color I expected at the assembly. only white wire I have is going to the backup lights. Thought I'd have more. Black and dark blue wires.Inside I'm reading 12 volts. Anyway does this look like the ground for the taillights its located on the hitch so I'm not sure if its for the hitch wiring or the coach. Probably would be difficult to trace it back. Just wondering for people who had to fix ground wires if this is what it looks like.

Its a ground for something. You will found many grounds on a rv. Looks bad.

Are you measuring the 10.5 volts across the back of the bulb socket? I would use the meter ground wire direct to the frame to get a good ground and make sure you have a full 12 volts to the bulb.But the connection definitely needs to be cleaned up no matter what it is for.

I measured across the bulb. Tried to run a find a spot on the frame for a good ground, but didn't have anything with me to get the paint/rust off. Didn't have 40 feet or so of wire either to connect to the battery. This bolt probably won't turn off anyway. Have to cut and drill it out I imagine. Maybe before I do that I'll cut the insulation back on the wires a little and wrap a wire around it and bring it to the front for a good ground and see if it makes a difference before I start cutting bolts. Leaving town in a couple weeks and don't want to make too many fixes before I hit the road:) Thank you for your help in identifying the ground for me.

Looks like the black one is completely separated. Note the green on the end which indicates it is copper.Yes, it could be ground for trailer connector and possibly the lights.

not sure about the black wire. Noticed it too, but didn't see a black wire anywhere down there. I think black is hot on a rv...maybe? The wiring on these things don't seem to make any sense to me, but I'm not an expert on wiring.

Bad Ground wire taillights Dim | Good Sam Community

angler
Explorer
Oct 11, 2019
I measured across the bulb. Tried to run a find a spot on the frame for a good ground, but didn't have anything with me to get the paint/rust off. Didn't have 40 feet or so of wire either to connect to the battery.
This bolt probably won't turn off anyway. Have to cut and drill it out I imagine. Maybe before I do that I'll cut the insulation back on the wires a little and wrap a wire around it and bring it to the front for a good ground and see if it makes a difference before I start cutting bolts. Leaving town in a couple weeks and don't want to make too many fixes before I hit the road:) Thank you for your help in identifying the ground for me.
BB_TX
Nomad
Oct 11, 2019
Are you measuring the 10.5 volts across the back of the bulb socket? I would use the meter ground wire direct to the frame to get a good ground and make sure you have a full 12 volts to the bulb.

But the connection definitely needs to be cleaned up no matter what it is for.
MountainAir05
Explorer II
Oct 11, 2019
Its a ground for something. You will found many grounds on a rv. Looks bad.

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Bad Ground wire taillights Dim

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