The Stovebolt Site Forums The Shop Area The Electrical Bay Horn trouble

I converted my '42 to 12volt with an alternator. The 6v horn works for a toot or two and then dies. I've replaced the fuse each time but no success. Everything is new but I can't figure out what's wrong.

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/

Thanks bunch. I'll try it

Replaced the fuse several times? Should we assume it is blowing these fuses each time? What else does the fuse serve? Do you have a 12V relay or a "good" relay. Did you just try grounding the horn case real good, disconnecting the hot wire, rig a jumper from the battery, and tap it on the hot terminal of horn a few dozen times?

History here says a resistor is not needed. The horn should work. If it blows a fuse, obviously it won't honk after that. So something is blowing the fuse. A resistor is not the answer.
Test it as above, no relay, no fuse, no horn button, just tap and honk. Increase length of honk a little to two seconds-three seconds. Report results. BUT let us know about the fuse ASAP.

1. Corroded horn contacts. Burnt contacts. Broken contacts.

2. Bad relay.

3. A short.

4. What era is the horn from? 1942 or ?

5. Fuse too small.

"too much" voltage to horn is not the problem.

Now Gerry mentioned that the horn works intermittently or tow or three times before blowing the fuse. So I wanted to drop the Voltage applied. This assumes the the horn is 6 Volt.

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