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12/09/22: I installed my horns today. After much debating, primarily with myself, with the input from our fellow ‘bolters, I decided to hook them up in series. I bought rivet nuts and a new installation tool to install in the firewall, printed a insulating spacer on my 3d printer and bought 1/4”-20 nylon bolts and washers. I had previously wired the two 6v horns wired in series on the bench to see if it would work and they did, so I was all set to do the install.

Unfortunately, my plan fell apart when I tested the install. Only the high toned horn worked. The low didn’t even make a click. I was baffled. I retested each horn separately on 12 volts and both worked, loud but did work. I tried adjusting the low toned horn while in series but to no avail. I tried feeding the low first then the high (opposite to the way it was), again no joy.

At this point, I decided after spending way too much time testing different ways to install these horns, to run them in parallel as was suggested earlier in another thread. After changing the wiring and reinstalling the horns, I retested the horns and they worked! Unfortunately, only for a couple of seconds. My first thought was I burnt them out, but then decided maybe it was just a blown fuse. Turns out when I originally install the horn relay, I installed an in line fuse which was only 10 amps which blew quickly trying to power twin higher amperage horns. I installed a 20 amp fuse and so far it’s good. Both horns work, a bit loud but sure to get attention. After all, isn’t that what horns are for?