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Old 10-13-2014, 01:06 PM   #1
Leviwalker OP
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Joined: Sep 2014
Oddometer: 11
12v on a 6v bike?

I have started working on a 75 CT90 and I noticed someone had put a 12 volt battery in it when it should have a 6 volt. What kind of damage do you think this would have caused and what should I do to fix it?
The bike runs perfectly, but none of the lights work except for my left blinkers.

*edit* I have already put in the proper 6 volt battery
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Old 10-13-2014, 03:01 PM   #2
Beastly Adventurer
Joined: Sep 2010
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At a minimum, the higher voltage probably blew every bulb filament that was activated. If it starts, runs, and appears to be charging the battery, maybe all you need is a double handful of light bulbs.
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Old 10-13-2014, 03:28 PM   #3
Beastly Adventurer
Joined: Nov 2005
Location: Westside WA
Oddometer: 2,168
You can convert a 6v system to 12v but there are rules. The charging system alt or gen needs to match or the battery will never fully recharge. Coil needs to match. You can run 12v through a 6v starter "for awhile" it'll spin like crazy "for awhile" till it burns out. Any light bulbs need to be upgraded to 12v or you'll near immediately burn them out. turn flasher needs to be upgraded to 12v. Any 6v accessories you want to keep after going to a 12v charging system will require a proper sizer resistor to drop the volts down to 6v or you'll fry that unit too. Make up your mind if you wanna go 6v or 12v, then make the appropriate mods/swaps.
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Old 10-14-2014, 01:11 AM   #4
Loose Pre Unit
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Location: New Zealand
Oddometer: 4,502
Yeah, blown bulbs, but the horn will sound great - just don't get carried away riding around town with your thumb on the horn button, it'll fry it.
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Old 10-14-2014, 02:05 AM   #5
Sparx MacGyver
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Joined: Jun 2011
Oddometer: 72
did you steal the bike from my garage? My '75 K6 had a similar issue. Previous owner put a 12v battery in it, but fortunately, I don't think he ever got it started since I put a 6v bttery in and it runs fine. Well, it runs...kind of. I'm having carb and headlight issues, but it's most likely connectors and wiring problems.

Anyway, if it runs great and keeps a charge in the battery, then swap some new bulbs in and see what happens.
1969 CT90K1
1975 CT90K6
1980 FL250 w/ '84 ATC200M Motor
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Old 10-14-2014, 08:45 AM   #6
Leviwalker OP
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Oddometer: 11
Thanks everyone, it's time to go check all the lights!
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