Re: 6 volt horn in 12 volt vehicle
Hate to disagree with Tom Endy, but the resistors that the vendors sell for this purpose work just fine. They are completely contained in the horn "can" so they do not affect the Model A "look". (Of course, this is probably immaterial for you.)
Yes, the resistor gets hot when you honk the horn, but unless you sit there and blow it for minutes at a time, they work o.k. The brief time you sound the horn is handled by the resistor.
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