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Thread: Shorted out battery BMW R69s

  1. #1
    Join Date
    Aug 2017
    Location
    Austin, TX USA
    Posts
    35

    Default Shorted out battery BMW R69s

    I screwed up, while I had my 1961 R69s BMW on a charger I shorted out the battery. I didn't find this out until later when the cables to the charger were melted. Later I put it back on the charger correctly and it seemed to charge but, I'm afraid I killed the battery, but not sure yet. It will not start now, even when on the charger.
    What other components should I look at if just replacing the battery doesnt work?

  2. #2
    Join Date
    Aug 2004
    Location
    Beautiful Northern New Mexico
    Posts
    2,797

    Default

    An R69S (or any pre '70 BMW) does not need a battery to run. The ignition is a magneto, not a battery/coil type. The battery just works for the lighting circuit (unless it has a solid state conversion, in which case you are SOL). Hopefully you did not ruin the magneto coil back feeding power to it. The key, when pushed down opens a ground circuit allowing the magneto to fire. Clean your points. Clean your plugs. If the magneto is OK it will run even if the battery is across the street.
    Robbie Knight Amca #2736

  3. #3
    Join Date
    Aug 2017
    Location
    Austin, TX USA
    Posts
    35

    Default

    Thank you Robbie,
    I have no idea what I was doing wrong but, I gave it a try again today and she started right up. I hate not knowing what I was doing wrong but, I'm not complaining. Also the battery seems to be fine because the lights work same as before.

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