[JoshuaTree]

To make the hot-tap for any 'ignition-on' power source, you can utilize the piggyback style blade push-on connnectors (usually OK for the horn). Your diagram is slightly off - in that you'll want to just connect the ignition-on power just to the relay coil. You'll then have a "master accessory fuse" that feeds the common terminal on the relay, rated at the combined total amperage of the devices you're going to run. Your accessories will power off of the "NO" (normally open) terminal. Make sure that you have supply wiring from the battery to the relay, and from the relay to the fuse block of sufficient gauge to handle the amperage draw. Same with the return wiring. Blue Sea stuff is pretty nice. There are some solutions also available at www.cyclegadgets.com - take a look at these: http://www.cyclegadgets.com/Products...t.asp?Item=CEN

I've done a bit of wiring on my bike...