Essentially all I’m looking for is a component that will “detect” current on the horn switch wire, and close a separate circuit.

I think you’re describing a transistor

Kinda mad how far I had to scroll down to see always sunny—so much content you’ve almost certainly forgotten something about an episode by the time you get around to it again

I subscribed to /c/gamedeals and /c/gamedeals@lemmy.blahaj.zone the other day!

(Not 100% if I’ve linked those up right)