Bill, of course it will not hurt anything to replace those cables, it may not be necessary and very probably is not the cause of the problem. I suspect that if we just put my battery in your car, it would start just fine. And it would run fine for a long time if your alternator is doint its job.
I can assure you, with positive certainty, that 10.57 volts WILL NOT start a car. And if your batteries can not hold at least 12.5 volts after a deep charge, then they are junk and must be replaced. I'm absolutely sure.
You only need one battery, not two. When the new battery (or batteries) is in, hook a volt meter to them. They WILL be above 12.5 volts. Then start and run the car. With the engine running, you should see between 13.5 and 15 volts. If this is not the case, then it was your alternator that killed your batteries.
I'm not discouraging you from replacing cables. But I am assuring you that pure copper cables 6" thick welded directly to the battery and starter will not start the car on 10.57 volts.
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'83 SC
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