Easiest way to wire up a transbrake button
85-keyed hot 12V
86-to master switch then from master switch to ground.(this will turn on the relay to get the trans brake ready for use).
30-fused hot 12V (run a fuse off of 12v source)
87-to one wire of t-brake to your t-brake switch. The other wire off your 12v switch will go to ground.
Or you can run a fused 12v to one wire on your t-brake then your other wire off your t-brake to a master switch then to your t-brake switch. It depends on if you prefer to run a relay or not.
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and don't forget to ground the solenoid as well
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