Is it an older one like a 10DN with a big external regulator?
If a 10/12SI Is it a 1 wire alt or a 3 wire?
If 1 wire, take it in for a checkup.
If a 3 wire, it should be wired as follows.
charge stud to the battery hot.
Charge stud to #2
#1 thru a small lamp or diode to a switched power source like the key switch. lamp can be like a 194, etc.
Now... this is important. the #2 is the voltage sense line. #2 needs to see charge or battery voltage with NO resistors, diodes or lamps inline.
If you put a resistor or lamp inline from power to #2, this is what happens. that lamp or resistor drops some volts. #2 sees that and thinks the battery is undercharging and raises charge output.
common vreg modules for that could be 14.4v but as high as 15.1
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