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 - Tuning-Up Your Tractor: Oil, Oil Filter and Air Breather - by Curtis Von Fange. In the preceding articles we discussed some of the various aspects of doing a comprehensive tune up. Hopefully some light was shed on why we do or don't do certain things pertaining to inspections and order of events when doing a tune up. Perhaps some useful reasons were given for why parts fail and what to do about preventing part failure in the future. All these tips will help us think and reason out a problem in order to make our tune up last and, hopefully, keep us from spending extra mone
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