Near the front of the 2 cycle oil tank. It has 4 wires (three yellow and one red). About and inch thick and 2 inches wide by 3 inches long (about) the out side of it is black. I think it attaches near the frame on the left side of the machine (if you were sitting on it) (by radiator).
The voltage regulator, or rectifier, is mounted between the radiator and the grill. It sits toward the left side of the ATV (as your sitting on the ATV). It is a thin black box with four, sometimes three, wires coming from it.
A charging system test is done to check the internal voltage regulator. It can be done at any auto parts place.
with a regulator tester kohler sale one that will test most regulators
How_do_you_check_your_voltage_regurlator_on_your_motorcycle
with a kohler regulator tester
If no accessories have been added that are draining the battery it is probably the voltage regulator . The voltage regulator will short out creating an open circuit , and the battery will drain back through it .
You need the test equipment and a bunch of knowhow.
the voltage regulator is located in the voltage regulator compartment
With engine running, ensure system voltage is in the 13-14 volt range.
it is inside the alternater, not stand alone.
Troubleshoot the voltage regulator
The voltage regulator is integral to the engine computer.The voltage regulator is integral to the engine computer.