Gerry, Maybe you need a resister in the circuit. This resister is used to drop the Voltage from 12Volts to something the horn can manage better.

I'd try a 1 OHM 50 watt resistor. The same thing veneers sell for the Fan circuit. Now running these in a fan circuit the resister gets very hot.

But in a horn circuit. Unless you really like to make noise......

https://www.classicparts.com/1941-54-Accessory-Voltage-Reducer/productinfo/24%2D996/


Julian Carter

1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC