Somebody verify this as I no longer have my Case to check but I believe the alternator sense and excite leads are frogged. The output should go to pin 2 and excite should go to pin 1. I've added a piece I wrote long ago in response to a 'battery drain' problem. Your 'sense lead' will probably/should include a diode or a mechanical switch to open when the engine is stopped. The oil pressure sender method is uncommon. Good luck, Sam
"Over time you'll see several ways to solve the excite/discharge problem you're having. What was installed on my Case when I acquired it is as follows: (1) Run a strap from the alternator output to pin (2). (2) Plumb a tee into the oil pressure gauge port and install a normally open (NO) oil pressure sender (use a low pressure switch) switch in one side and the gauge pipe in the other. (3) Run another wire from the alternator output to one side of the switch. (4) Run a wire from the other side of the switch to pin 1. When the engine starts and the oil pressure comes up the switch will close battery to pin (1) and excite the alternator. When engine is stopped the oil pressure drops and the battery is removed from (1) so no drain."
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