As little as possible
the alternator voltage at the battery should be between 12.4voltsv-13.6 volts
they should fluctuate when your revving your engine and letting it down to idle that's the voltage regulator stopping the alternator from putting out to much power it is perfectly normal.
Output of the alternator is controlled by the voltage regulator.
From the alternator to the battery should be 14v
The most likely cause is the voltage regulator in the alternator. Modern vehicle voltage regulators aren't serviced separately, so you would just replace the alternator. That much voltage can boil the battery. Typical alternator output should be around 14.5 volts.
the voltage regulater is built into the alternator it regulates how much volts gives to the battery
13.5 to 15.5 volts.
13.5 to 16 volts.
no there is not a fuse built into any alternator that i have seen to date (been a mechanic for 10 yrs) HOWEVER most vehicles have a charging fuse located either in-line or at the fuse panel so that if the rectifier or voltage regulator goes out the battery does not receive too much voltage or the wrong type of voltage ac versus dc in short no the alternator doesn't but the vehicle should have one in the alternator circuit
The alternator output should fall between 13.5 to 14.5 volts.The alternator output should fall between 13.5 to 14.5 volts.
Alternators should produce around 14 volts. I say around because this can vary with temperature, engine speed and the age of the alternator. If you think yours is kicking out too much it's probably the voltage regulator. If you think its not enough it could be the brushes. The easiest thing to do is to pull it and take it to a parts store; most of them will test your alternator for free.
There are times when the alternator will test out fine as far as amp output and voltage output but if your alternator has a weak diode(s) it may trigger the light to go on. I hate to say you should replace the alternator, but your charging system is pretty much self contained in your alternator so I believe the problem is in fact in your alternator. Good luck.