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Re: Electric trailer brake lock switch
if you want a way to wire a stand-alone switch that doesn't backfeed into the controller, use a relay.
Wire a SPDT relay as follows:
[85] jumper together with terminal [87]
[86] connect to your chosen activation switch, then the other side of that switch goes to ground
[87] wire to a high-current capable + source (power feed to brake control would work)
[87a] cut output from brake control to trailer brakes and connect end that goes directly to controller here
[30] connect other end of cut wire (out to brakes)
Closing the switch will apply full battery voltage to trailer brakes AND isolate the controller from any backfeed.
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2003 F350 CC, Short, XLT Sport (leather), 7.3PSD, Auto, 4x4. Homemade Tymar, Blizzard 810 Power Plow
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