Light issue

[Xsue21]

Hello everyone, I have a 2003 Jeep Wrangler TJ before I do state my problem. I have changed the headlights, taillight, turn signal, the fuse check the ground under the hood cleaned it. Nothing seems to work. Sooo when I have the lights on the right signal and right brake light does not want to work but when I have the lights off, they work perfectly. Im losing my mind with this situation has anyone doubt with this situation

 

[Chris]

Has it always done this or is this issue a result of modifying / changing something?

 

[Xsue21]

Has it always done this or is this issue a result of modifying / changing something?

I got the jeep with this problem, didn’t realize till later that when the lights are on does this

 

[Chris]

Hello everyone, I have a 2003 Jeep Wrangler TJ before I do state my problem. I have changed the headlights, taillight, turn signal, the fuse check the ground under the hood cleaned it. Nothing seems to work. Sooo when I have the lights on the right signal and right brake light does not want to work but when I have the lights off, they work perfectly. Im losing my mind with this situation has anyone doubt with this situation

Here are a few things you can check:

You mentioned checking the grounds under the hood, but also look for ground connections specifically for the rear lights. A bad ground can cause strange behavior like what you're experiencing.

Sometimes the bulb sockets themselves can get corroded or have a poor connection. Make sure they are clean and make a good connection with the bulbs.

Visually inspect the wiring harness for any signs of fraying, corrosion, or shorts. Pay close attention to areas where the wires might rub against the body or frame.

If everything else looks good, the issue could be coming from the turn signal switch (multi-function switch). This isn't uncommon by any means.

If you have access to a multimeter, you can test for voltage at the light sockets with the headlights on and off to diagnose if there’s a change that shouldn’t be happening.

Hopefully, one of these suggestions leads you to finding the root of the problem. Good luck, and let us know what you find!

 

[NskLJ]

Hello everyone, I have a 2003 Jeep Wrangler TJ before I do state my problem. I have changed the headlights, taillight, turn signal, the fuse check the ground under the hood cleaned it. Nothing seems to work. Sooo when I have the lights on the right signal and right brake light does not want to work but when I have the lights off, they work perfectly. Im losing my mind with this situation has anyone doubt with this situation

Most likely a ground problem, check taillight ground and the bulb socket

 

[Xsue21]

Here are a few things you can check:

You mentioned checking the grounds under the hood, but also look for ground connections specifically for the rear lights. A bad ground can cause strange behavior like what you're experiencing.

Sometimes the bulb sockets themselves can get corroded or have a poor connection. Make sure they are clean and make a good connection with the bulbs.

Visually inspect the wiring harness for any signs of fraying, corrosion, or shorts. Pay close attention to areas where the wires might rub against the body or frame.

If everything else looks good, the issue could be coming from the turn signal switch (multi-function switch). This isn't uncommon by any means.

If you have access to a multimeter, you can test for voltage at the light sockets with the headlights on and off to diagnose if there’s a change that shouldn’t be happening.

Hopefully, one of these suggestions leads you to finding the root of the problem. Good luck, and let us know what you find!

Finally solve the issue. We dig into the wiring more and find out the previous owner had no idea how to wire correctly so now everything works

Most likely a ground problem, check taillight ground and the bulb socket