I am not sure about the 2nd issue but I'm willing to bet the horn problem was the contacts on the horn relay on radiator support being closed all the time. Did you hear a bunch of clicking? Anyway, the circuit was closed and disconnecting the horns did not stop the circuit and that drained the battery.
Did you recently do anything to the horn relay? I found that if you accidentally reverse the 2 black power wires to it (because they look the same) the relay starts clicking away without pushing the horn button. Or possibly the relay went bad?
And congrats to you and your wife.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
