Help with 6v to 12v conversion CD175 - Page 2
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Thread: Help with 6v to 12v conversion CD175

  1. #11
    Junior Member Scott1556's Avatar
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    Hi, my name is Peter and have just joined this group. I have a 1973 CD175 A4 and would like to convert it to 12v.
    I had thought about using a dc to dc boost converter to just run 12v lighting. Any help on this topic would be most helpful.
    Kind Regards
    Peter

  2. #12
    Senior Member Sonreir's Avatar
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    Definitely an option. Make sure your converter can handle the amperage and you should be good to go. You'll need to isolate the 12V circuits from the rest of the 6V, so you may need your own grounding as well. We happen to carry what you need: 6v to 12v Step Up Converter - Sparck Moto
    Scott1556 likes this.

  3. #13
    Senior Member Rod Fryatt's Avatar
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    Peter, I have have converted my CD175 to 12v. It is dead easy.
    There is enough output from the alternator. All I did was change all the lamps, fit a cheap 12v reg/rectifier from China and fit a 12v battery. Fitted a 2 ohm resistor in series with the ignition coil and reduced the current in the horn by trial and error with a coil of thin wire. In other words a home-made resistor.
    I had a 12v starter motor available but I understand many people have found the 6v motor copes with 12v OK if you don't abuse it with long running.

    Oh, nearly forgot, changed the flasher control box as well.
    Richard_Pitman and Scott1556 like this.

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  5. #14
    Senior Member Richard_Pitman's Avatar
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    Fully agree with Rods comments, simplest is best.

    For that matter, 12v alternators from CB175, CB200, even CB250/350 with a few simple mods, are readily available secondhand. Chinese reg/rec for a fiver off Ebay, 12v universal LED compatible flasher relay for not much more, 12v horn off any old bike, new pattern 12volt coils are cheap as chips. 12 volt battery is likely to be the most expensive part of the conversion, if you go for a decent AGM one.
    Scott1556 likes this.
    1970 Honda CB175K4
    1972 Honda CL175K7
    1999 Honda CB600 Hornet
    1970 - 1972 Random heap of CB/CL/SL 175 parts, slowly being reassembled ..

  6. #15
    Junior Member Scott1556's Avatar
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    Hi Rod,thank you for the information it was most helpful. The only problem I have at the moment is finding a 12v headlight bulb
    to fit the strange looking bulb holder.
    Kind Regards
    Peter

  7. #16
    Junior Member Scott1556's Avatar
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    Hi, thanks for the information and that’s the sort of converter that I am looking for. Unfortunately I live in the Uk, and this
    part isn’t available over here.
    Kind Regards
    Peter

  8. #17
    Senior Member Richard_Pitman's Avatar
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    Quote Originally Posted by Scott1556 View Post
    Hi Rod,thank you for the information it was most helpful. The only problem I have at the moment is finding a 12v headlight bulb
    to fit the strange looking bulb holder.
    Kind Regards
    Peter
    Have a look at some of the Chinese scooter or monkeybike headlamp bulbs. I found a 12v one to fit my 6v CG125 headlamp the OORacing website.

    https://www.ooracing.com/bulbs.html
    1970 Honda CB175K4
    1972 Honda CL175K7
    1999 Honda CB600 Hornet
    1970 - 1972 Random heap of CB/CL/SL 175 parts, slowly being reassembled ..

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