You can play guessing games - or you can stick a amp meter on the system to find out for sure what is going on.
Voltage only comes up after the amperage flow and demand slows down. If a battery is going bad, and is constantly absorbing a charge of current, the voltage cannot rise properly.
Not much different that a water system that can build high pressure with the faucet held wide open.
If the alternator is not working properly, it is still sort of the same situation as a bad battery. Not enough amperage is being provided to satisfy the need and let the voltage rise.
You could also have a situation where the battery and alternator are working fine, but there is an excess current draw on the system.
Very often, Delcos lose part of the diode trio and lose some charge capacity and can cause this - as well as many other things.
The whole deal could be diagnosed in 10 minutes with an ampmeter.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
... [Read Article]
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