Where lights up when that bottom center plug has power? Pull it out of the plug clean it up and show a photo of it. How tight does it fit on the switch terminal spade?You can see in the second picture, the bottom center wire is not all the way in. I make it a point to push it in by hand.
The bottom right is the constant hot.
It certainly looks like there is some arcing going on there on those terminals. If the photo was taken at a little more of an angle so the flat sides could be seen would tell more of the story.
If when plugged on the switch the “rivet” lug on the switch that the spade is on has power on the wire you say is the constant power but the switch doesn’t contact internally to power the output spade what tomtinker said about your new switch might be true, it is bad. You may have to build a couple of short jumper wires with male and female spades on each end so you can see what is going on. One installed on the wire that has constant power and one on other circuits checked one by one. A connection can show continuity but not be able to carry current (amps) when a load such as a headlight is on it,I don't have voltage leaving the plug.
Yes that is the horn wire, Purple and Black. So does the serial number plate say "Made in United Kingdom or Made in United States of America".I have this single wire that was not attached to anything, I assumed it went to a horn but my tractor doesn’t have a horn or button.
I have made jumpers and connected the hot to the switch and am not getting anything on output. I keep leaning towards bad switch but this is a new oneYou require a new plug or if you can't find one at an auto parts store, buy the proper size spade connectors and heat shrink tubing and connect wires individually to the switch connectors.
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