Steve,
Your observation that the wiring had been "cobbed up" to steal Michael's expression, would lead me to disconnect all the lights in the rear and get out the old voltmeter.
Take a stick and press the brake pedal down to activate the switch and see if you get 12V on any of the wires back there. If you don't then your plan of completely tracing it out is the way to go.
However, if you do get a 12V brake signal, your task is much simpler.
__________________
Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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