Generator Help

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rdgrail

New Member
Nov 7, 2021
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Hello fellow enthusiasts! I'm Nick, I'm new here. I was wondering if someone could help me with my little predicament?

I bought a 12v batter for my bike to power the lights, and I want to charge it while I'm riding. I bought a 12v generator that hooks to the magneto, and a rectifier to the battery. I need to make sure I have this hooked up correctly.

I have the red wire coming from the generator going to the yellow wire on my rectifier, red going to battery +, and green going to battery -. Is this correct or should I have the green grounded to the bike frame? I've seen other threads about this, but I can't get a straight answer.

I have attached some pictures.

Thank you for your help.
 

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iamsteve03

New Member
Dec 18, 2021
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Yes. At least they are all supposed to work that way. Some small bikes (unlike cars) can be kick-started and run even without a battery. But all motorcycles with a battery also have a charging system. Therefore as you have stated your procedure, it seems completely fine. Nice work.
 

Tony01

Well-Known Member
Nov 28, 2012
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sf bay area
Your best bet is to get a 3s Lithium battery for an rc along with a cheap balance charger in the range of 4-10 amps. You are looking for about a 5000mah aka 5ah or bigger battery. Don’t run it under 10v. I built batteries for a living this year, including the 12v that runs my car (12v40ah 1000a peak). Just charge every 1-4 rides depending on your amp load and ride time. Way easier than figuring and messing with a charger setup. I did it with a dynohub. It worked but it sucked. Had cops flashing high beams at me when I was stopped at intersections. Didn’t charge that battery enough.