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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.
 
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.
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?
 
It controls the front two lights. It will make a good connection if I push it on after the plug. I don't have voltage leaving the plug.
 
I don't have voltage leaving the plug.
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,
in other words looses it connection.
 
You 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.
 
You 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.
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 one
 
Do you have a VOM with OHMs scale? Are you in North America or Uk or Europe as the head lights appear to be at the bottom of the grill?

Looking at my wiring diagram the switch appears to have two 12V feeds, B1 - bottom Left Pin on Switch from fuse #3, B2 - top center pin from Fuse # 5.
 
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Yes, I do. It will not OHM from the "hot" spade to any other no matter which position the switch is in.
I'm in North America. The headlights are at the top of the grill, the grill/hood are off the tractor for access to all the other gauge issues.
 
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