There wasn't an ammeter. Besides an ammeter is NOT voltage sensitive and a voltmeter is a useless gadget that gives no useful information.
All the accessories and lights ran on 12 volts, some on plus 12 volts, some on -12 volts because the battery center was grounded.
Yah, you need a new alternator or generator when changing from 24 to 12 volts. Its in the kit that Deere will happily supply.
Sometimes the fuel gauge set up for -12 volts reads differently on +12 volts. But it does work. I changed my gas 4020 from positive to negative ground and the fuel gauge still works.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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