I’m about to sell, with some sadness, my 1978 Honda CB400A “Hondamatic” motorcycle.
I have one last problem with it – that’s been baffling me for over a year.
When I consolidated the speedometer and “idiot lights” to a svelte new cafe racer style chrome LED-based single instrument, I found that its neutral light was always on, no matter what gear.
So I finally figured out a clever (if I may say so) way through research to use the “proverbial $7 part” from in-stock Radioshack – a RELAY switch!
Here, I describe and show the problem, step through a bit of the bike’s electrical system, and show you how I used a relay to fix the problem.
I’ll be sad to see you go, little Decaf!
The awesome video learning tutorials I used on Youtube to determine relays were for me!:
RELAYS – How to wire and how they work TUTORIAL !!
How An Automotive Relay Works and How to Wire ‘Em up