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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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