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I have an old exmark zero turn (model LHP19ka465 serial # 657447) that when I turn the ignition key to the on position the fuse (purple wire) blows. I have check the wiring hardness for shorts but nothing. I disconnected the pto and fuse still blows. any suggestion?

Violet (Purple, Bruple) wire is the voltage regulator wire.

Most likely it is the voltage regulator that is shorted.

how can I check the voltage regulator for a short

If the Kawasaki has the three terminal regulator then you first unplug the AC wires from stator and test. If it still blows the fuse unplug the B+ terminal and test. If still bolw with the regulator completely disconnected then you have a short on the mower side of the wiring harness.

You can also perform the following test if you have VOM or DMM testers.

Note: the meter probe position across the top are positive (+) Lead and the meter probe position on left side down is the negative (-) lead.

replaced regulator turn key to on position and the red fuse blows?? the purple as ok