Can anyone help understand better as to how the horn wiring works on my 73 tradesman? My horn isn’t working, I have a lime green and black wire that is hot at the horn and a dark green and white wire that isn’t at the horn. I trace it back yo the firewall and it hot. I also am getting that it’s hot on the inside of the firewall but from there I’m at a loss. I take the cap off the horn and I see a black wire about 6 inches long that isn’t hot... that’s about where I’m at. I’m not sure what’s suppose to be hot and what isn’t or where to trace to from here. Just one of those small things that’s never worked that I would like to have working.

Thanks for any help.