Join Date: Nov 2011
Location: Southeastern PA
Thanked 24 Times in 23 Posts
Electrical gremlins are the worst to diagnose. The proper way to do this is to sit down with the wiring diagram and a pencil and trace all the pathways to and from the bulb, switch, etc. Budget 3 hours. That said, I'd start by spending $20 and replace the relay and double check all the multi-connectors I could reach. And maybe spray WD40 on the high/low switch and toggle it it back and forth for a while.
'61 Clubman's Gold Star, '13 Duke 690, '13 Daytona 675R (track bike), '18 Street Triple RS, '20 R1250R