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my 2 cents worth, i had converted my a to 12 volts and while doing some maintenance i accidently burned up the field coils in the 6 v horn. i measured the old wire size and counted the turns on each coil. i ordered some magnet wire 1/2 the size of the old and wound back twice the number of turns on each coil. some electrical engineer will tell me i'm nuts and completely wrong.... but it works and sounds right on 12v.