That model didn't use a starter solenoid, just a mechanical switch incorporated into the shifter. If the starter is staying engaged, something is up with the switch.
Typical 6 v starting problems are:
Wrong size cables. Six volt systems pull lots of amps, need size 00 cables, bigger the better. Can't buy them at Auto Zone, have to go to a truck supply, have them made. Another trick is to move the ground cable from the body and go directly to the engine.
Worn starter bushings. Starter dragging, pulling too many amps, nothing left for spark.
The usual problems also, loose, dirty connections, low battery, bad battery, generator or regulator problems, ignition problems, fuel problems, low compression.
If you get everything right, it will start on 6 volts. There is also a Harry Ferguson board below, lots of specific info there. Hope this helps!
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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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