I have a 99 corolla that has a stoplight problem. The left light isn't working although the bulb is good. I can't do much tracing but there is no power to the socket. Anyone have any experience with the wiring? Is there a fuse for each bulb or a wiring diagram available? Any help will be appreciated.
How do you know that the bulb is good? Did you try a known good bulb, like from the other side?
How do you know that there is no power to the socket? Did you test with a ground other than the socket's ground or did you test between the positive and negative terminals in the socket? If you checked between the positive and negative terminals in the socket, it is possible that you have no ground and there is power coming to the socket. The most common reason of rear light problems is a loose ground somewhere back there. Check all ground wires to make sure they make good contact with ground.
I checked the bulb across the battery with jumpers and it lit. I checked the socket with a vometer to the chassis ground. No juice.
When I read your original post, I missed the question about whether there is a fuse for each bulb, and the answer is no - left and right side share one power source. Since it is a tail light/brake light socket, I'm assuming you checked both filaments in the bulb and both worked. Assuming that the turn signal bulb is a separate bulb, then you should only have to trace back to where the harness splits left and right. If that doesn't work, then wire a parallel circuit from the right side.
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