The horn on my new '27 wasn't working. Adjusting the tension on the brushes got it quacking like a duck, but I'd like to know:
Is it a 6 or 12 V horn? No markings I can see.
If it's a 6V, can I safely use it in a 12V car with a series resistor matching the motor coil resistance?
Where does it need lube, if at all?
The diaphragm seems fine but what looks like a cork gasket is very thin and crumbly. Advice on material to fashion a new gasket?
Is this a common Model T horn?
The patent date is 1914. Is it from an older car?
That's a motor driven horn - Klaxon style - not stock Model T.
Could have been used on a number of cars in the teens and twenties. Aftermarket if used on Fords. Do a search on Google books and you may find some period advertisements for it. Use a date range of 1910 through 1930 when searching.
Lubricate the motor bearings with light machine oil.
You can also clean the commutator.
It's six volts.
I have a motor driven horn on my touring. Here's what a few drops of oil did to it:
Oh, the gasket. How about cork? Any local auto parts store should have it.
Found a lot of coverage/press releases in period trade journals - click on this link:
Just one example:
A thick blotter paper will make a fine diaphragm gasket. much of the sound is dependent on that gasket!
I adjusted everything and lubed it up. It makes a good loud noise operated at 12V, but the motor doesn't even turn when I drop the voltage to 6V. When did 12V electrical systems become common? Is it possible the motor was replaced with a 12V DC motor at some point in its history? The coil resistance measures about 1 ohm, so a 6A draw on 6V or 12A at 12V.
Dodge Brothers used 12 volts from '14 until Chrysler took over. Others did too, so yours could easily be a 12 volt horn.