trailer wiring - be careful here!

[Huw Powell]

> We'll need a relay to work the brake lights, a relay to work the parking
> lights, and a pair of relays to work the turn signals. Which immediately
> brings us to another gotcha: Wiring the turn signal and brake light relays
> in parallel will make the turn signal filament burn steadily when the
> brakes are on, and wiring them separately will make the trailer's turn
> signal flash in reverse to the car's signal. (car on, trailer off, trailer
> on, car off.)

one relay for each sides park/brake light will work if you use the cars
turn signal and brake signal wires to trigger the relay.

-- 
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/