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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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