It sounds like you have a broken ground wire to your brake light so the light won't come on. When you turn on a signal you are completing that circut so the brake light then steals ground from that circut. In theory your brake light should also flash in sequence with the signal so that would confirm that problem. Brian
Testimonial: "Thank you very much, that is very helpful. Would you have any idea where the ground is on a Jimmy? I will take a look when I get to work tomorrow."
Wild guess, crossed wires, bad printed circut film connector in tail lights, bad ground connection to the same film. Otherwise, wiring problems up front. signial/ break circuts.
Testimonial: "Circut Film? What is that?"
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