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American Bosch Magneto Horn - Need Help

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  1. #1
    cyberdan started this thread.
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    American Bosch Magneto Horn - Need Help

    I bought this horn yesterday at a yard sale for $1.00 It is brass so I figured even if it didn't work I had several pounds of brass. Well it does not work and I hope some one out there can help. The main reason is I found the exact model on feeBay for $475.00 I hooked it up to an 18V battery (Ryobi drill) and also a 6V 1000ma transformer and not even a noise like it wanted to do something.


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    It is really pretty simple. A relay opens and closes actuating an electromagnet.
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    A metal rod goes through the electromagnet moving the round disk and it creates a noise.
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    Here I am cyberdan, at yardsales I am dollardan

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    Check the electricals with a multimeter or have someone do it for you ?

    Maybe the electrical contacts are corroded ?

    Check all the moving parts to make sure they aren't seized up with age & corrosion ?

    Probably dates back to the 1920's ? That's close to 100 years old.

    Probably 12 volt DC but it could be 6 volt DC ?

    Hard to know which wire is the hot and which is the ground. It might work one way but not the other ?

    Might need a car battery to run it if it draws something like ten of fifteen amps ?
    Last edited by hills; 10-11-2021 at 07:55 AM.

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    cyberdan started this thread.
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    Quote Originally Posted by hills View Post
    Check the electricals with a multimeter or have someone do it for you ?

    Maybe the electrical contacts are corroded ?

    Check all the moving parts to make sure they aren't seized up with age & corrosion ?

    Probably dates back to the 1920's ? That's close to 100 years old.

    Probably 12 volt DC but it could be 6 volt DC ?

    Hard to know which wire is the hot and which is the ground. It might work one way but not the other ?

    Might need a car battery to run it if it draws something like ten of fifteen amps ?
    The only moving parts are the relay (it opens and close nicely) and that steel rod that gets inserted into the electromagnet. It came out nicely. But if I can't get power to the electro magnet I can't see if it vibrates.

    I see no corrosion except external rust and tarnish. The inside looks fine.

    I might just try selling on feeBay to someone that know more than I do about things like that.


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