Standard headlight bulb? LEDs will confuse the reserve lighting device and it will show a 'bulb out' light in the cluster and will switch from low to high beam intermittently. But, it does sound as if a ground of other connection is the problem here. The bullet connectors normally work fine, but are not all that high quality, so connections do go bad over time.
When I re-connect wiring, I routinely pinch the female connectors so that they will make better contact with the bullet.
I finally figured out why I like Ducatis: With their exhaust note and dry clutch, they sound almost like a Guzzi!
Last edited by po18guy; 10-9-2019 at 4:44 PM.