I have a WR426 (no battery) and while I'm OK with 12VDC electrics in cars, I know very little about bike electrics. I want to wire up a new computer fan to cool the rad. Fan is physically in place so now I need to hook up 12V. I'm simply going to run a manual switch in the circuit. A mate says that my bike doesn't actually produce 12VDC and that the fan won't work because the old WR puts out AC power ? Is this the case ? If the WR does actually produce DC current, is it OK to use the frame as an earth/return path (like the chassis ground on a car) or must I always hook up to an existing earth wire that returns back directly to bikes alternator/rectifier or whatever ? What are my chances of frying the bike electrics by fitting the fan or other 12VDC devices ? Anyone recommend good resources for explaining bike electrics in simple terms ?