Re: How to tell if horn is 12 volt
Get a variable resistor, put it in line with the horn, then dial the speed and sound you desire.
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'31 Fordor Deluxe 2W Briggs 170-B / blackwalls
'41 Fordor Deluxe / 2-duece flattie
'66 1/2 Dodge Charger
'14 100th Anniversary Challenger Limited Edition.
Semper Fidelis 
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