3rd Brake Light?

[Spartan Mark]

I have a crazy idea to mount a pickup truck-style 3rd brake(red)/bed (white) light on the back of the carts top. Thanks to JohnnieB, I will use a 36v relay to activate the white lights through the backup beeper wiring, but for the brake light, I'm sort of stumped. I have a GTW LED street-legal kit which will be installed that includes the brake light activator switch that mounts on the brake pedal. Which is the recommended method of wiring the 3rd brake light? Directly to the wires that come off the pedal switch? Or should I tap into the brake light wire (at the pedal switch) and run it through a 12v relay, keeping the 3rd brake light on a separate 12v line (probably from the fuse block)?

[JohnnieB]

If the pickup truck style light assembly uses incandescent bulbs, I'd use a relay with a 12V coil activated by the brake light switch, or by a tap on the wire to the LED brake lights.

Personally, I'd use LEDs for the backup lights and the high center brake light since incandescent bulbs are very inefficient.

[Spartan Mark]

Thanks -- my plan was to use LEDs for the hi-light and backup light. That does make things a lot easier!

Of course, this just leads to more questions.... I'll probably need to figure out if the brake switch activates a relay inside the controller unit of the harness, or if it just completes a circuit to the brake lights. Wish I had this thing installed so I could test it out.