If you have a junction box in the system, just unhook them all, then run a test lead with a light fuse or circuit breaker in it, and put power to each leg out of the junction box til you find the one that is drawing too much amperage. You can use a multimeter, but the one I have is only rated for 10 amps for X seconds every so many minutes, as I imagine all but the very top-end units would be.
If you have room in the J/box I would also run a hot lead back to it, stick the lights on a relay, and then the relay would be the only thing that your brake switch would power.
Also, what kind of plug do your lights have? Check the 3-way plug on the back of your lights if it has the sealed lights like semi-trucks run. I have had a connector corrode and feed power between the tail lamps and the brake lights.
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Today's Featured Article - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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