My 2001 883 runs bad with the lights on. It runs fine without the lights on, but when I turn them on it sputters a bit. I have about 12.6 volts at the battery with the engine off, and about 14.5 with it running. It doesn't seem to fluctuate with rpm changes. The idle speed changes when turning the light on and off. The bike has a new coil, new ignition switch, and the battery is about 2 years old, and I use a battery tender. I am suspecting a wiring problem because the wiring seems a bit butchered. Any advice would be appreciated. Thank you.