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Thanks for the help, exactly my thoughts. I do like the idea of a voltage meter (analog as I am old school), because I do not have to hook it to the ignition switch and could wire it from the alternator with a simple ground. The purple wires pu2 also pigtail over to the engine light so I can at...

Reattached JD wiring diagram image.

The Alternator on my John Deere 1020 wore out along with the external regulator. (Replacement Alternator $175, Regulator $57) So I decided to upgrade to a GM 3 wire alternator $50 with internal regulator. Hooked up the new regulator with main hot wire from starter and regulator worked good...