Originally Posted by mrfixit54016
Direct wire from the battery with a fuse in it to a 12V relay. The relay is turned on and off via your key switch. Just tap into any positive wire such as the headlight power to activate the relay.
be careful where you tap into the headlight power...I hooked my O2 sensor to my headlight power then one day I'm out riding and hit my high beams and poof...my O2 sensor stopped working...WTF?, hit the switch back to low beams and the O2 sensor comes back on...well...crap...one more thing to modify...