My original horn didn't work, disassembled as you have, windings are not open, contacts are clean, I couldn't make sense of it. I installed a couple of Craigslist horns to make mine road legal.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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