Where you wired the diode IS FINE THATS NOTTTTTT THE PROBLEM. BUT we dont know for sure if its wired same as the diagram remember??????
I usually wire them to the IGN output of the key ignition switch butttttttttt thats the nearly same point electrically as the hot voltage INPUT SOURCE to the push button as you have it and the switched input to the ballast and coil. i.e. the same voltage is present on the key switch output as the push switches input and input to coil/ballast........
WHERE YOU WIRED THE DIODE HAS THE SAME AFFECT AS IF ITS WIRED RIGHT TO THE COIL OR DIRECT FROM THE IGN OUTPUT ON THE KEY SWITCH
Soooooo now that where its shown IS FINE (provided your diagram is same as on the tractor) lets diagnose other possible causes
1) Do you have a 10 Gauge wire from the Alternators big main output stud up to the Load side of the ammeter??????????
2) The diode is polarity sensitive and the Neg Cathode (banded as shown) end must wire to the Alternator SURE YOU HAVE OT RIGHT???? It should pass current to the alternator to excite it when the switch is on BUT NOT allow reverse current to flow out of the alternator to power the coil when the key is off (prevents backfeed so engine dont run when you turn of key)
3) If she ran when ign was off, the coil was getting a voltage backfeed from the alternator either because the diode was wired backwards or was bad or it wasnt wired as shown.
4) SURE YOU HAVE THE BATTERY AT NEG GROUND???????????????????? If not you may have fried the alternator
Also for Neg ground the coils - wires to the distributor while its + gets ignition switch voltage.
CHECK FOR POLARITY OF BATTERY,,,,,,,,POLARITY OF DIODE,,,,,,,10 GAUGE WIRE FROM ALTERNATOR UP TO AMMETER
Hopefully neither the alternator or diode have been fried.....
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