12volt horn?

There are adjustment screws on most horns and they can be
adjusted to work on 6 or 12 volts. G.M.
 
When I converted my '39 p/u to 12 volts I didn't change the horn. Just hooked it up. Plenty loud. The sound is a bit different but it definitely gets people's attention.
 
My 54 has been converted to 12V but using the 6 volt horns. They are LOUD but no problems with them. Was done over twelve years ago.
 
Horns were originally manufactured and adjusted to a certain amperage draw for the ******** circuit. The points can be adjusted but a person needs to know what amperage to set it at to insure longevity of the ******** coils and points. Higher voltage will change the current draw. A large resistor can be installed in the circuit to drop the voltage & current back to normal.

Wiring them is series will change the current draw but I don't know if the drop factor will equal what a dropping resistor will do.
 
Reference the thread I started:

https://www.fordbarn.com/forum/showthread.php?t=278797

The '35 horn(s) probably have a different current draw than my '41, but you could experiment like I did to arrive at the right amount of resistance. Maybe start with one 0.5 Ohm resistor (10 watt). The horn will probably not work at all with that value. Just keep adding resistors in parallel until the horn works on battery alone (engine off). Two 0.5 Ohm resistors in parallel would result in 0.25 Ohms; three would be 0.167 Ohms; four would be 0.125 Ohms. Mine worked with the 0.125 Ohm configuration.
 
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