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Old 06-27-2017, 12:32 PM   #3
rotorwrench
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Join Date: Jun 2010
Location: San Antonio, Texas
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Default Re: Horn Button Meltdown?

The old Fords didn't have fusing for all of their circuits and the ignition switch was for the coil and gauges to turn on. Lights & horn were independent from the ignition switch. The hot wire for the horn should connect to a relay on most cars. The early cars didn't use a relay but as horns were doubled up, the need for one became evident. Horns draw a lot of current. Something had to cause the heat so there was likely a circuit going there somewhere.

Crazy things can happen sometimes. I was surprised one time by a melted carpet in a helicopter. When investigated, we found that the sun light was getting refracted through the plastic bubble just enough to concentrate some heat energy on the carpet. As the day progressed it would melt it in a line across the floor. That was the damnedest thing I had ever seen. The customer either had to install a cover or pull it back in his hangar to keep it from happening again. This was one of the old bubble types (Bell 47J). They had quite a green house in there.
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