Any 12 Volt automotive relay (commonly referred to as "Bosch style") will work. Since the headlight fuses (in the engine compartment) only have power when the headlights are on, I installed a tap-a-fuse to the left headlight fuse that runs to one side of the relay coil - the other side of the relay coil goes to ground. The power to your white switchback lead is then connected to the "common" and "normally closed" contacts on the relay. When the relay is energized (by turning on the headlights,) the connection will be disconnected and turn off your switchbacks.is there a specific kind of relay that i would need to turn them off with my headlights on? and what wires do u have hooked up to the "turn-off with headlights on" relay pins?
also, what can i do to make the switchback flash "amber-on, amber-off, amber-on, amber-off" instead of "amber-on, white-on, amber-on, white-on"?
Here's an amazon link to a relay that will work:
Amazon.com: Car Auto Truck Relay & Socket SPDT 12V 12 Volt DC 40A AMP 5Pin: Car Electronics
Here's an amazon link to a tap-a-fuse that will work:
Amazon.com: WirthCo 30103 Tapa Circuit for ATM Mini Fuse Blocks: Automotive
Regarding changing the switchbacks from Amber-Off to Amber-White, that is not possible - you'd have to buy different switchback bulbs.