Lost all electrical power all of a sudden while parked. I tried charging it but would not accept charge.

Have the electrical system checked . Battery ,charging system etc..... Do you have a DVOM - digital volt ohmmeter ? Check out youtube videos on testing battery an charging system.

Battery connections , cable problem , electric motor . Voltage drop test the electrical circuit's . Cables can an do go bad .
Starter Voltage Drop

Probably the fuse. Look for fuse labeled auxiliary power.

You needed to do some testing before you replaced anything. I give guys and gals the same info, I don't know any other way. You could use a digital multimeter for testing full charge at the battery, you could also check charging system. If there is a wiring circuit problem with any of the parts you replaced, replacing the part won't fix it.

If your saying the starter motor won't crank, check the starter wiring. Any testing at the starter make sure tranny is in park or neutral and the parking brake is set. Usually at the starter, there are two voltage terminals, one is battery voltage, hot all the time. The other circuit goes hot with the key in the crank position. I can't rule out your ignition switch at the moment?

Some makes and models, if battery voltage is lost, it can effect your security system?

Could have lost freon charge, or a faulty pressure switch or other electrical problem.
A mechanic would check for system charge and power at the compressor clutch.

It can be either voltage regulator, alternator or the battery is not holding a charge. Start with the regulator first it is the cheapest. most parts houses will test your electrical system for free.

It seems you have this posted in the wrong product category. please re-post. Thanks

turn every thing on in park if voltage drops change alt

The charging system is doing its job It seems to have an electrical short which is draining the batt. If u have the know how to ck & repair electrical shorts then go after it, if not, take it in.

most likely the alternator has failed, the battery is low on charge due to that, u will need to have the battery charged then the alternator and battery tested.