Re: Horn tests
I would remove the horn cover and unplug one wire and ground the horn terminal. If you don't get the horn to blow, or at least a spark, then plug the wire back in and remove the other wire and ground that terminal, and try it again. If you have a volt meter it's easy to test which wire is hot. It doesn't matter which wire goes to which terminal. The ground terminal leads to the horn button, and quite often the horn button doesn't make a good ground due to years of corrosion from not being used. I push the button down and roll it around as it's pushed, and sometimes this will get the horn blowing again.
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