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Hi, and welcome. My name is Marty. Have you replaced the stop light switch at the pedal?
Ok, are you able to test for power to the stop light switch? Either that or you can just connect the two wires of the switch together and see if the brake lights come on. It sounds like your new switch is defective.
If the lights come on when you connect the two wires together you have a bad stop light switch. If the lights don't come on you need to test for voltage to one of the two wires to the switch.
Just unplug the two wires from the switch and jump them together with a piece of jumper wire.
Ok, how were you able to test for power to the switch? Did you use a test light?
If you have tested for voltage to the stop light switch with a test light or voltmeter and found no voltage at either wire you must a have a fault with the fuse or the fuse box or with the wire from the fuse to the stop light switch.
Ok, why don't you just run a new wire from the fuse to the switch.
Ok, did you run the wire from the fuse or from the battery? Why don't you run power to the switch directly from the battery so we know we are getting power. It doesn't make sense that you would have no power to the stop light switch and when you run power directly to the switch the stop lights still don't work. I can't imagine that you have multiple problems but I suppose it's possible. I'd run a wire directly from the positive battery cable and touch it to each one of the wires to the brake light switch and make sure that the brake lights turn on.