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Old 07-30-2017, 07:46 AM   #1
wrndln
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Default Polarity for horn

I don't know much about motor driven ahoogh horns. My question is: Does the polarity make a difference when connecting the battery and horn button wires to the horn? It seems like the motor would rotate in different directions depending on the +6 polarity.
Rusty Nelson
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Old 07-30-2017, 08:18 AM   #2
Jon-Ohio
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Default Re: Polarity for horn

No it doesn't matter -the horn is not polarized.

Jon in Ohio
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Old 07-30-2017, 10:42 AM   #3
holdover
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Default Re: Polarity for horn

the noise makers, the gear and the diaphragm, doesn't care in what direction it turns..
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Old 07-30-2017, 02:14 PM   #4
Tom Wesenberg
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Default Re: Polarity for horn

It's a series wound motor, so it turns the same direction which ever way you runs the wires.
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Old 07-30-2017, 03:21 PM   #5
nstegall
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Default Re: Polarity for horn

Rusty,

Tom and the others are correct. It does not matter.

Hook up your wires and begin to enjoy "The sound that was hear around the world".

Neil
THE HORN MAN
601-469-0878
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Old 07-30-2017, 03:31 PM   #6
wrndln
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Default Re: Polarity for horn

Thanks to all that responded. I guess I should have figured it out myself, as there are no polarity marking on my horn.
Rusty Nelson
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Old 07-30-2017, 03:48 PM   #7
RawhideKid
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Default Re: Polarity for horn

Hey Rusty, the horn IS a DC motor and is polarity dependent, BUT, because the motor only rubs the button on the diaphragm, it can do it in either direction, so it doesn't really care which way it is hooked up, BUT remember this, if you hook the Blue/Yellow to the right side terminal and tune the horn, be sure to always hook that wire to the same side because if you turn the wires around, it will work, but you will need to retune the horn for running in the other direction due to break-in wear.
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Old 07-30-2017, 05:29 PM   #8
harleytoprock
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Default Re: Polarity for horn

Tom is correct. Regardless of polarity wiring, the armature will always spin in the same direction.
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Old 07-30-2017, 06:42 PM   #9
RawhideKid
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Default Re: Polarity for horn

Now see, you took ALL the fun out of him trying either direction to see IF the horn indeed needed to be retuned.

Some people.....

See, what I suggested would cause NO harm, and would be a teaching experience. This is how folk learn about the car and retain that knowledge.
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Old 07-30-2017, 07:33 PM   #10
Magicbox51
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Default Re: Polarity for horn

You mean Ahooooga would not sound like agooooha?
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Old 07-30-2017, 07:54 PM   #11
JDupuis
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Default Re: Polarity for horn

Thanks Bill G (Magicbox51). LMAO . Jeff
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Old 07-30-2017, 10:36 PM   #12
Tom Wesenberg
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Default Re: Polarity for horn

A series wound DC motor, such as the Model A horn and starter will always turn the same direction, no matter which way the battery is connected,

To change the armature direction, either the field windings, or armature windings need the polarity changed is relation to the other.

A DC motor with a permanent magnet will change direction when the battery polarity is changed because the permanent magnet never changes polarity. Some of the newer car starters are now using permanent magnets, as are the window motors heater motors, and door lock motors.
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Old 08-01-2017, 06:41 AM   #13
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Default Re: Polarity for horn

duplicate message

Last edited by johnbuckley; 08-01-2017 at 06:47 AM.
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Old 08-01-2017, 06:42 AM   #14
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Default Re: Polarity for horn

As always Tom, you're correct.... and just to avoid confusion that goes for the southern hemisphere too
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