What can cause the turn signals and brake lights to stop working if the fuses are okay?

Answer 1

There could be many things causing that problem. Here are some suggestions:

Since the brake sights go through the turn signal switch, something is causing the ts switch not to receive any voltage. You just have to trace the wires and find out what happened. It could be the ts switch itself.

I had the same problem on my 98 Grand Marquis. I fixed the problem by spraying WD 40 around the hazard hazard flasher switch, located on top of the steering column. This is a multi-function switch that contols turn signals, brake lights, and flashers. After spraying, I pushed it down with my thumb and let it pop up several times and also wiggled it around a bit. It worked for me - problem solved. Apparently, over the years gunk finds it way in there, be it dirt, liquids, etc.

Responses to the WD-40 advice:

Cleaned my Jeep Wrangler 2000 yesterday and when I started to drive to work this a.m. someone waved at me from their car and informed me that my brake lights were not working. I then noticed that my turn signals and hazards were not working either. First thing that came to mind was that the poor Jeep was in shock from its yearly cleaning...I stopped at a gas station but attendant was clueless. Came home and found the post about the WD40 - this only after having read others about green and white wires and brake switches which I wouldn't recognize even if they danced a jig for me but that I did crawl around and look for anyhow. After reading the WD40 post I snatched my trusty WD40 from under the sink, ran to the patient (Jeep) - sprayed, jiggled, sprayed, jiggled and lo and behold I have hazards, turn signals and brake lights again !! WD40 is my very best friend and to the guy who posted the advice to use it.

Noticed my brake and turning lights weren't working and after looking through the fuses and wires tried the WD40 trick. Worked like a charm!

I am shocked, but the WD40 trick worked for me too! I spent about 4 hours tring to fix the 'short' in my 1999 Jeep Wrangler, and almost gave up. Thanks to everyone who posted answers to this incredibly frustrating problem!!

That Is wild, I bought a 1998 E150 high top Conversion van, so I tried everything out, not to mention trying things I rarely use like 4 ways, well I noticed last night my Turn and Brake signals were out, So this Morning In the Rain I started working on it, so I did the fuse thing, I traced the wires for the Alarm system, and Still nothing, Then I got to wondering since I have not bought a manual for it, so decided to look online running back and forth in the rain to my computer trying different things and came upon this Post and I didn't have WD-40 but I did have PB blaster and I sprayed a little along the side of my 4way button and Boom everything works again... Wow Im really happy but wet that I found this post .. Great trick

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Thanks for your help, Rickgmi. Recently my left brake lamp on my 93 jeep yj became intermittent. Also, I noticed the left turn signal did not usually work right either. I did not connect the two, and proceeded to try to find a short in the wiring to the brake lamp.. I made it from the brake lamp assembly to the harness under the dash, to no avail. Frustrated, I went online and found your post. I sprayed WD40 as best I could on the interior of the hazard light switch, and the turn signal switch assembly. I had my brake light hanging over the back door (working by myself) to see it from the driver seat, and things were all messed up. I remembered that the lamp assemble must bee grounded to the body/frame to work correctly, as it does not have a dedicated ground wire. I immediately re-attached the lamp assembly, and WHALAH!! Your fix worked like magic. I really appreciate you taking your time to post this fix. It saved me hours of frustration and $$$!