I rewired my horns when I went to 12-volt 10 years ago. I put them in series instead of the original parallel. Of course, I had to insulate the first horn in the circuit using nylon bolts and several pieces of plastic milk bottle between the mounting plate and the firewall.
It seems the 2nd horn might get an oscillating current from the 1st but it seems to work.
1948 3/4-Ton 5-Window Flatbed Chevrolet 34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
