Get this and other widgets at roytanck.com
Auxiliary Power Relay
2/23/09 Blog: Anyone needing an easy and inexpensive fused power supply that is turned on by the key switch will be interested in this modification video. The relay in the video is a simple 12vdc coil single pole 30 amp power relay commonly found at most automotive stores. This can be used to power numerous accessories including your GPS, heated grips or a 12vdc cigarette lighter adapter to charge your cell phone. It's quick, simple, easy and hidden. The print I mention in the video can be found here.
HQ Version click here.
Dave Soli's Fuzeblocks video here.