Andrew – First off, never, never, NEVER, ground either ammeter post! You can ruin the ammeter, set the wiring harness on fire, and if the engine is running even burn out the alternator by grounding the ammeter!
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To your other problem: You need to wire up some sort of switch to manually or automatically excite the alternator at startup. There are several options to accomplish this:
1 – Install a oil pressure switch with normally open contacts (ie. contacts that CLOSE on sensing oil pressure) on the engine. Wire this switch between a constant 12 volt source and the ammter #1 terminal. The pressure switch will “turn on” the alternator when it senses oil pressure, then break the circuit when the engine stops.
2 – Install a momentary pushbutton switch in place of the above. After starting the engine, push the button briefly to “flash” the alternator and cause it to start it charging. (So long as it remains spinning the alternator will continue to charge after you release the button.)
3 – Replace the tractor’s existing magneto kill (ignition) switch with a DPDT toggle switch. Wire one pole of this switch to ground the magneto with the switch “off”. Wire the other pole to supply 12 volts to the alternator #1 when the switch “on”.
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