Rewiring horn and wiper motor for 12 volts

[nkaminar]

Has anyone tried this? Both the horn and the wiper motor are wired in a way that does not allow the 2 field winding to be changed to a different configuration for 12 volts like you can do with the starter. But I have an idea on how to fix this.

The magnetism is a function of ampere-turns, or the amperage time the number of turns of wire used. So to reduce the magnetism with 12 volts back to where it was with 6 volts it makes sense to me to remove half the turns of wires in each field electromagnets. For the horn the number of turns is about 44, so I would unwind it so that only 20 turns are there. The armature cannot be easily changed but the whole motor would be different with the field winding not being as strong.

Your thoughts?

[brokenspoke]

The horn has been covered here....the search function is your friend

[Badpuppy]

You need to double the number of turns to get the same current. Flux density is a function of field current. You can use a slightly smaller wire gauge so it fits. Much easier to use a 1.2 ohm 50 watt resistor in series. More efficient to use a 12/6V 10A reducer if you can find one, and that can work with positive ground.

[Tom Endy]

Attached article on how to rewire the horn for 12-volts.

Tom Endy

[Badpuppy]

Thanks, Tom. I have your procedure in my files, just couldn't find it to post. Very clear instructions.

[nkaminar]

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Thanks Tom. Exact opposite of what I was thinking. Very helpful.

[Smog Tech]

I followed Tom's instructions on rewiring the horn for 12 volts. Horn works better than it did on 6 volts.