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passenger brake light failure - basic diagnosing help, please

I'm back in the "I don't know what I don't know" arena.

My passenger side brake light will not work ('90 240 sedan). I have replaced the old white socket with a brand new one, and put in a new bulb. Both other brake lights work. The circuit sheet is a bit distorted around the blank (lower middle) hole, but not around the brake light hole. Also, apparently I have no fog lights at all, either... I'm not exactly sure which slot they are supposed to show up in.

While I know how to replace broken wires, I don't know how to test for where the break is. I completely missed physics, so if someone can take me through it step by step, including a basic of using an ohmmeter, I would appreciate it. It's time I learned so I'm not so intimidated by wires!

This car will see the road again... I think I can, I think I can, I think I can...

Thank you, thank you!
ezsha






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