I have a 1997 bad boy, I was riding home the other night and noticed my headlight going bright and dim. so I check the voltage off the battery and the wires on the headlight all was good. so now I am stuck on what to check next.

 

With it running at 2000 check the voltage on the cable were it hooks to battery. Then put the check on the actual battery terminal. Shake the wire. Does voltage change? If so the connection or wire is bad. If not it could be regulator. However before going there, charge battery good 24 hours and remove and have Harley dealer or AutoZone do a load test on it for condition.