Myself, I would ohm meter (continuity) check the switch to see how it functions. Without a ground on the switch itself in the schematic, it has me scratching my head.
I used a new universal wiring harness wiring with an old 60s Napa switch. 51 didn't have a dash indicator, so I drilled and welded in a spot on the speedo opposite the hi beam light. Used a metal single wire bulb housing.
And like bill has said, diodes to iliminate reverse voltage from switch that isn't just like original to single dash bulb. I found a pre-made dual diode harness for incandescent motorcycles. 2 in from left and right and single out to dash bulb. It was about $10, but already has leads and heat shrink. I think it is called 'motorcycle single turn lamp indicator diode'.
Last edited by Chip O; 08/03/2024 5:59 PM.
