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! Full wiring diagram for Relay switch and also all 5 paired lines to 5 LED consolidated speedometer/instrument cluster (10 lines)
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 (thanks, guys!)

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