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Discussion Starter · #1 ·
For some reason my brake lights won't both work at the same time. When I push the brake either the right or left light will work but not both at the same time. Obviously I have power there but what would cause this to happen? Thanks
 

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That is a good one. Since there Is enough power at both take a look at the grounds. Remove the lense and there is 3 bolts that hold the light assembly to the tub that is the ground. Clean the bolts and the tub and see what that does.
 

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This is going to sound crazy as heck but was the jeep rear ended?

I have seen jeeps with bondo work around the lights and the ground will not ground through the bondo

So follow Jokers advice and clean them first then check to make sure it is actually grounding

Chief
 

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Harley not sure who your question is to but what I was talking about is that the screw holes had bondo in them and so the ground was not consistent and as the vehicle was driven the lights would work and not work depending on whether or not the ground wire had good contact to metal.
 

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how is a bad ground going to magically jump back and forth from one side to the other
It can happen, I had a boat trailer do the same thing one time and it was a corroded ground. Im an electrician by trade and I hate working on car systems. DC voltage would drive Jesus crazy, I hate it..
 

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It can happen, I had a boat trailer do the same thing one time and it was a corroded ground. Im an electrician by trade and I hate working on car systems. DC voltage would drive Jesus crazy, I hate it..
newer vehicles with all their useless ( in my opinion ) bullshit can be a pain.but,there is nothing more simple than an older vehicles lighting system.when I build a cj or a harley,I just completely wire them from scratch.40 years ago the navy sent me to some fine electrical and electronics schools.I have worked on 3 phase,single phase and dc.to me dc is easy until you get to these newer systems with all the sensors interacting with the ecu.they will make you scratch your head.the problem could be a ground but with it switching and always being left on or right on,never both on or both off,I would say that it would most likely be the turn signal switch because both brake lights go through that switch on seperate contacts.a bad ground would tend to be more random...just my opinion
 
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