I looked and did not see any wire on the muffler, maybe becaues I couldn't see on top of it? I did put a meter on all the lamps, all are good. Left or right side for the harness? same side as the plate, driver's side?
Check the fuse for the lights back there. If it is good, then you need your self a DMM (digital multimeter). Check that you have power & ground at the connector. If you do, most likely the bulbs are bad. Which you can just look at the bulb & tell if the filament is open. There are times when it doesn't appear like it is, but it is open. You can always pop a new bulb in & see.
If you have no power/ground back there & the fuse is good. You are going to need the wire diagram. It probably just goes through the switches. But each car company have their own setup for shit. So there could be a relay or something.
Having similar problems on my '94 YJ. Checking all fuses, but I can't figure out which one is the brakes because it isn't labeled. Took the diodes out that my dad installed for towing it. briefly got one brakelight working. hazards both blink, so it isn't the filaments. no brake lights (even the third) and no burnt fuses. Going to start threatening the jeep with wire snips and pictures of ford broncos.
Hey everyone, I got a real duzzy on my hands. I have no rear turn or brake signals on my 2008 Jeep Wrangler. The third brake light works fine though. The front blinkers work fine also. Just no rear brake or turn signals. I checked the fuses and bulbs. All are fine. I took a test light and checked the towing harness and got ok results at the towing harness. I next checked the harness to the point where it connects to the tail light assembly. Got good readings at this point. When I reconnect the harness back up to the tail light assembly I get no results. Still no brake or turn signals. Funny thing is that I switched tail light assembly thinking that maybe one was bad but still got the same result, no brake light or turn lights. Man, I'm bum fuzzled on this one. With me getting good readings on harness to rear tells me that my modules should be working fine. HELP!!!
Check for power where the bulb goes in. If you got power there. Then it's ether the contact point isn't touching the bulb& it needs to be adjusted (I've fixed many vehicles this way, that's all it was). Or the bulb it's self isn't good. Sometimes you can visually see the open in the filament. If you tap the bulb, you should see the filament bounce. Sometimes it still doesn't do it. You could use a dmm to check for continuity on the bulb. Put one lead on the side of the metal case& the other on the tab on the bottom. You could also use power& ground to light the bulb up to make sure. Ground the side of the bulb & power the bottom. Doesn't light up, it's bad.
Also make sure you have power& ground at the actual connector for the bulbs. I don't know how you have the trail harness splice in, so I'm just saying to check it this way.
My Passenger side blinker and brake light are now working sometimes. I noticed that they seem to stop working once the lights have been on for a little while, I know not an exact measurement but it has only been two days. I lose the brake and turn signal bu the running lights continue to work. Turning the vehicle off and back on seems to do the trick to get them going again. I did the trailer wiring months and months ago and it is connected to the driver side lights. If anyone has found a fix I need it.