Fog Light/starter Button Wiring

[madmoomoo]

Hey lads and lassies,

Just a bit of a question about wiring. I've done some research on wiring setups for fog lights. This seems to be the standard setup in the following picture. It all makes sense to me, but I'm just wondering about the wiring with the switch on it - aren't you effectively short-circuting a 12V source to ground (via switch and relay)?

I don't think there's a load across it, so wouldn't it be the same as putting a wire across +ve and -ve terminals of the battery?

So, presuming that everything is ok, could I use the same wiring diagram to hook up a starter button for the car? (with the 12V coming from ACC and a momentary switch instead?).

Hopefully someone out there can help me...

cheers.

[R33S2]

A relay is a magnetic activating switch ie it switches when activated. The earth is to complete the circuit for the magnet.

They are used so as you dont have a hugeassed switch on the dash etc.