Electrical gremlin

[smith]

My left brake light does not work. Replaced rear wiring harness, no change. Replaced harness that goes from the rear harness to the fire wall, no change. Replaced the brake lamp plunger switch at the pedal, no change. What next? Where do the wires that are behind the fire wall end up?

The weird thing is that it is just the left one- and no it's not the bulb...checked that 3 times first.

Help!

Thanks.
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