Might be a bit later, but I've just installed the Rivco Mirrors and I spliced into secondary wiring harness in the rear under the seat. Just behind the plug that goes to the rear lights and all. That way you don't hack into the main harness. All wires are splice into and soldered. It works really great. All might biker buddies are dumbfounded hope well they work. Only thing that I've found with these mirrors is they do not have enough play on the knockle to allow up and down and even lateral movement. Have fun!