28 HP charging system
My mid 90's 28 horse is over charging the battery. We have checked this with an external digital voltage meter thinking it may have been a problem with the dash gauge. We also tried at different battery. At above 2000 RPM the charging system slowly raises to 18 plus volts and can only be brought back into the normal range by turning on some lights. Under 2000 RPM all seems normal.
What controls/limits the voltage to the battery? is there a voltage regulator similar to an automobile? Is this an easy fix?
Thanks for any info, stumped!