You should check the wiring loom on the left trunk hinge. It gets damaged very often on these bmw's you won't be able to see if there is damage from outside, you need to pull the protective rubber covering pretty far down to inspect.
If it's damaged any decent audio shop can repair it (or you can do it yourself if you're good at soldering)
after it's fixed replace any burnt fuses and it should be ok
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If the brake and turn signal are on the same bulb than you can Orin straight wiring. If the brake and turn signal are on different bulbs than you'll need a wiring harness with a converter box.
I'm pretty sure the wrangler has the brake and turn signal on the Same bulb so let's start with basic trailer wiring.
The green wire on the trailer harness is for the right side turn and brake for the trailer. This wire should be attached to the wire on the vehicle that supplies power to the right turn signal/ brake light.
The yellow wire is the left turn signal, brake light on the trailer and should be attached to the wire on the vehicle that supplies power to the left turn signal /brake light.
The brown wire is the tail lights on the trailer and should be attached to either the left or right side wire on the vehicle that supplies power to the tail lights.
The white wire is grounD and it is vitally important that this wire be attached to the vehicle in a manor that supplies a good ground. Failure to suppy a good ground will result in all kinds of funky problems with the trailerer lighting such as all the lights linking when the tail lights and turn signals are on at the same time.
If you have any specific questions I will be more than happy to try and help.
The right side tail light and plate light get their power
from from the left side. The first thing to do is change
the bulb, if this fails, use a 12v test light or meter (the
light easier in this case) and check the power wire
from left to right. If you have power from socket to socket, check the ground, if you have good power and ground and a new bulb. Replace the socket.
Hope this helps. Good luck.
You need to check for power and ground. If you dont have a volt meter you can get a good cheap one from radio shack. If there is no power recheck with a known good ground. All the lights on that side share a common ground. Check the sockets for signs of burning or corrosion. There is a plug in the left rear quater panell. If you have no power check the corrisponding wire at that connector. The wires splice togeter just before the connector. So if the other brake/tail light is working you know the problem is after that. Hope this helps. Im sure you'll find the problem.
Do you own a test light? Check for power at wires behind socket? Clean socket good , check contact spots for bulb & clean any rusty side of the socket with emery cloth, or sandpaper, for good contact also.