oh, one more thing if i'm feeding the switch part of the relay from a physical switch, do i just wire the switch so that it has +12v on one end, and the other end goes to the relay activator thing... i dont earth the switch or anything stupid do it.
Best is to use a fused +12V feed to the relay activator thingie
, then use the switch on the earth of the relay. Less change to fuck it up, worst thing is when you short the switch it will keep the relay activated.