Originally Posted by Sir. Waffles
Where did you get the USB socket from??
Ebay, these guys: http://www.ebay.com/itm/251122104452...84.m1439.l2649
Just keep in mind that it needs to be put on a circuit that has no power with the bike off. It is lit, and draws a small amount that could kill the battery over many days.
PS I tested it yeaterday and it works great, even in the rain!