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 Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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