I never found the accessory plug under my seat. I found a plug with a 15A fuse in it, but it didn't seem to lead anywhere. Weird. Anyhow, I managed to install my blue LED lights this afternoon. Ran the wiring straight to the battery, with an in-line fuse, and installed a switch on the left side panel. It's hard to get a decent picture of them though. They look much nicer than these pictures show.