So, I restored the vintage horn on my '52. Got it working great on the bench at 12v. Installed in truck and immediately burned up the spring in the contact at steering wheel. Replaced and happened again. But heavier spring in contact and added horn relay. Horn would work occasionally and then stop working. I could jump a spare 12v battery across terminals and get it working again for a few blasts.
Finally, I decided to change polarity of wires at horn. No more trouble and horn works perfectly all the time every time. Why, I have no idea. Just thought others might like to hear this in case they are having the same trouble...revers the polarity at the horn.
