I'm going to install a lead for some Gerbings and I plan to use an electrical accessory power block and I want it on a relay so it's off with the ignition although I plan to wire in an on off switch. I'm a novice on the electrical side so I'd appreciate any advice - i.e. powering the relay so it's off with the ignition - where do I tap in to a power source? It's a 2004 gl1800. Thanks in advance for any suggestions on this.