Author Topic: 79 cb650 wiring. In need of HELP  (Read 864 times)

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Offline 79Bobber

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79 cb650 wiring. In need of HELP
« on: December 28, 2019, 07:36:57 PM »
Hey everyone new here and for good reason lol for the last little while I’ve been building a bobber style bike from a 79 cb 650, I’ve gotten all the fab work and easy stuff out of the way and now fallen into the wiring, I want to keep the bare minimum of the original harness (just what it needs to run) but not even sure where to start, any wiring masters on here?


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Offline Airborne 82nd

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Re: 79 cb650 wiring. In need of HELP
« Reply #1 on: December 29, 2019, 11:04:35 AM »
Hey everyone new here and for good reason lol for the last little while I’ve been building a bobber style bike from a 79 cb 650, I’ve gotten all the fab work and easy stuff out of the way and now fallen into the wiring, I want to keep the bare minimum of the original harness (just what it needs to run) but not even sure where to start, any wiring masters on here?


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Every ones bare minimum might not be the same it will run with out a brake light but you will get stopped if not hit in the ass end or are you just wanting to run it in the shop and not on the street?

Offline 79Bobber

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Re: 79 cb650 wiring. In need of HELP
« Reply #2 on: December 29, 2019, 11:10:46 AM »
Hey everyone new here and for good reason lol for the last little while I’ve been building a bobber style bike from a 79 cb 650, I’ve gotten all the fab work and easy stuff out of the way and now fallen into the wiring, I want to keep the bare minimum of the original harness (just what it needs to run) but not even sure where to start, any wiring masters on here?


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Every ones bare minimum might not be the same it will run with out a brake light but you will get stopped if not hit in the ass end or are you just wanting to run it in the shop and not on the street?
I’m just looking what I need to run the bike and then add lights signals and what not after it’s up and running, the stock harness is full of wires for neutral and signal lights and a bunch I don’t need


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Offline Bodi

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Re: 79 cb650 wiring. In need of HELP
« Reply #3 on: December 29, 2019, 04:33:36 PM »
You need to connect a few things to get spark. There's a pickup sensor in the engine that gets connected to the two spark units - two yellow wires to the 2-3 one and two blue wires to the 1-4 one. Then each spark unit needs switched (so you can stop the engine) battery power (black wire) and ground (green wire). The coils connect to their spark unit with a yellow (2-3) or blue (1-4) wire. The wire connectors kinda show which of the three same color wires on each coil go where, but do not connect them wrong. Those spark units are not too strong and are hard to find if you blow yours out.
Once you get spark that's all it needs electrically to run. The starter is pretty easy to connect if you want that. I can't recall if your bike has a kickstarter.

Offline Joewago

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Re: 79 cb650 wiring. In need of HELP
« Reply #4 on: December 29, 2019, 09:49:15 PM »
No kickstart on the 650. You need to sit down and nail down what all you're gunna have wired up at the end of the project and do it all at once because it's a lot easier to make things neat and tidy when you aren't doing it piecemeal. If it's your first time wiring anything or playing with electricity I recommend you stick to the harness. But if you're feeling froggy, you can replace the expensive reg/rect with generic parts for much cheaper but you *need to know your stuff.* You could also do the cavalier coil mod, which is pretty sweet. But know what you're getting into. Youll have to draw your own diagrams, be smart about your grounds, distribute fuses accordingly, think about how you'll even mount and strap everything.... It's a lot of work to do it from scratch.