If you hook up a pair of 12 volt batteries in parallel (pos to pos, and neg to neg) - yes - you will get higher cranking voltage and it might work better. I'd wonder why you need to do this though? Pitted contacts inside the solenoid-switch? Bad connections? Too much valve clearance stopping the ACR from working on the camshaft?
One 12 volt battery will usually crank the starter at 9 to 10 volts. 12 volt starters are designed to work at 9 volts. If you use two batteries, the voltage drop will be less and it could gain a volt and crank at 11. That 1 volt makes a big difference. Of course, if your connections/cables are bad, doubling batteries in parallel won't help.
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Today's Featured Article - Grain Threshing in the Early 40's - by Pat Browning. The setting is rural Wisconsin, halfway between East Troy and Elkhorn, on Hodunk Road, our nation was at war, and I was 6, 7 and 8 years old. George was our "threshing neighbor." He was the one with the threshing machine, a JI Case on steel wheels, and he pulled it to our farm with a JI Case standard tractor also on steel. In those days, steel wheeled implements were common. The roads were general gravel, so the lugs cutting into them wasn't a problem. George would set up the thresher, s
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