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 - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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