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You've got the wrong kind of socket for your bulb -- you need one that has two wires on it. But with a 1-wire alternator, you shouldn't need this part (wouldn't hurt either, if done right). If it's supposed to be a 1-wire alternator and it doesn't charge, you may have a bad alternator. However, let's check a couple things first (some are pretty simple, but it's the simple things that often trip us up). 1) Is it a modified Delco (GM) alternator? If not, everything after this question gets real cloudy. 2) The BAT post on the back of the alternator is wired to the battery? 3) The negative post of the battery is wired to the frame of the tractor (negative ground)? 4) The tractor was running when you touched the wire from the BAT post to the P1 terminal? Did you try touching the P2 terminal? (the only 1-wire instruction sheet I've seen says either one should work but who knows) 5) Try running the tractor faster (run it up to full throttle once) and see if that makes a difference.
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