Well . . . sometimes you can, but it's a rare circumstance.
A 12 volt starter motor is designed to work properly at 9-10 volts. Some cars/trucks with light-duty direct-drive starters can be made to have problems when greatly over-batteried and cranking voltage gets up near 12 volts. But, that's pretty hard to do.
One example is my 64 SS Chevelle with a 327. Due to high compression pistons, over-advanced timing specs with a hot cam etc. it was a hard cranker at times. Since I had many big batteries around, I got the bright idea to install two huge tractor batteries in the trunk with 2/0 cable running up front. Cranking voltage jumped from 9.5 up to 11 volts. It made a huge difference in cranking speed. But - no matter what I did, I could not get the Delco starter drives from breaking. Finally went back to one battery and no more failures. Eventualy, I installed a gear-drive starter.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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