I was at a party a while back and using my truck for the music (i had the best sound system of the vehicles there). Problem was, to power the radio, the key must be in. A few drinks later, a couple of friends decided they wanted to be idiots and go for a ride. Luckily i was nearby and could stop them. My solution to this is a switch and relay setup, using a SPDT relay in reverse (two sources to one output). I don't know if this will work, so i wanted to run it by some people who are good with electrical. Here's my plan. 85 and 86 will be wired as usual to energize when the switch is flipped. This will change the power from ignition switched on 87a to 12V input on 87 and will run through the relay and ouput on 30. Does anyone know if a relay will work in reverse like this?