Quote Originally Posted by toadster View Post
thanks - I tested continuity with my other brake/clutch switch since it's extra (Coyote includes it's own clutch switch)

  • the two prongs closes to the button are NC
  • the two prongs at the end of the switch (furthest from the button) are NO


it seems I could wire both the brake lights and the ABS sensor to the NO prongs then, no need for a 2nd switch
BUT in the FFR setup the button is always pushed at rest, so I probably can wire to the NO ports on the end of the switch - does that make sense?

I guess my next determination is to figure out if I should put in a relay to the ABS unit and use the brake switch as that trigger for the relay?
So there are two sets of terminals on the brake switch. Put the switch in whatever state it is in when the brake pedal is released (switch plunger pushed in). While in that state, determine which set of contacts has continuity. Pick one of those two contacts and connect it to a +12V source (either hot all the time or switched via your simulated PCM power relay). Connect the other contact to pin 6 of the ABS module. With the switch in the same state, verify that the other set of contacts does not have continuity. Pick one of those contacts and connect it to your +12V brake light feed. Connect the other contact to your brake lights. That should satisfy the ABS controller (at least the brake pedal sense portion) and make the brake lights operate correctly.