The first effort is to find the reason the battery goes dead in 1/2 hour. If it is charged up with an external battery charger, the battery should keep it running for a week if the lights are not used. This points to a bad abttery, or insufficient chatging of the battery befor starting it. Remove one terminal from the battery post, and charge the battery slowly (8 to 10 hours on slow charge, or with a trickle charger (2 amps). The attached diagram should help. The diode is 3 amp 1000piv radioshack. JimN Then take a light bulb (1156) and connect the center contact with the battery post, and the side base to the battery cable (putting the filiment in series with the system. If the switch is off, and the lights are off, the bulb should not light up at all (even dim). if it does, there is a substantial drain, and it might be the diode set internal to the alternator. Have the alternator checked at a Auto store. If it does not light, reconnect the battery. Use an analog (needle and scale type) meter to check battery volts. (put the leads directly onto the posts of the battery). With the tractor shut off the voltage should be about 12.6 volts. Start the tractor. with it running the voltage with a fully charged battery should be 14.2 to 14.7 volts. If it still reads battery volts (about mid 12s), it is not charging. On the alternator, the number 2 small terminal should be connected to the big terminal on the alternator. the #1 terminal can temporarily be connected to the battery positive terminal with a jumper. If it now reads 14.2 to 14.7 volts, the problem is in the exciting circuit that you said had the appearance of a light or diode.
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