Quote:
Originally Posted by TA_C10
So cruise control(dbw or cable box), LED lights, and a relay. What ls1nova71 means exactly here is that you take the brake switch wire(from the inside of cab, white wire off switch) or either left or right brake light wire outside of cab, and splice into that, one end of the wire attached to relay 85 pin, the other end of the wire attached to relay 86 pin. You DO NOT GROUND the relay. You are only using the relay coil inside the relay like it's a "resistor".
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This is not exactly what I meant. I suppose you could wire it this way, however, by splicing the relay in as you describe, you are putting it in series rather than parallel in which case you would be losing some voltage to the brake lights. This may not be noticable on LED brake lights though, but I would recommend just tapping off the brake switch wire and grounding the other side of the relay so you have the full 12v going to the brake lights.