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Old 07-04-2008, 04:49 PM
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Originally Posted by speedydude
Confused by your answer Chet. If it were charging a low battery, wouldn't the charging voltage would be higher??, say the high end of 13+ volts and maybe come down later. This is at 13.34+/- charging a low &/or flattened battery.

Doc's post leaves me thinking my alternator is on it's way out since it's not at 13.96-14.4. I just thought if I'm gonna pick up a new battery, should I swap out the alternator as well since it may not be up to par???
No the voltage will be lower and the current will be higher. As the battery charges and the current starts to go down the voltage will start to rise. One thing to concider is a lead acid battery does not like to be flattend out. If it goes completly flat a few times it wil never come back all the way. Also if it gets real flat, have it charged, dont depend on your alternator to charge it. You will either shorten the life of the alternator or burn it up. On a flat battery a slow long charge is the best way to charge it, it wont damage the plates by overheating them.
if the battery is junk and the alternator is working constantly to charge is the voltage will be lower. If it is somewhere in the 13's it is probably working.

Try a new battery

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