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 - Stories From Old Farmer - by K. Pratt. Old Farmer, a.k.a. Dale Jensen began posting messages to our discussion forums at the grand age of 75. With extensive knowledge of farming and tractors, he valued the past and the ways that went with it. He shared these values with us until shortly before his passing. I spoke with Dale in his last days and requested his permission to share some of his stories with the readers of our magazine. He agreed, and provided the
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