I need the electrical diagram. Putting a charger on with the positive and negative poles revised would be bad?

I need the electrical diagram for a Husky Jump-Start Systems, model HSK012HD. I have a replacement charger but the positive and negative poles may be revised. It would be bad to use this charger.
The replacement charger is a generic model, the positive and negitive poles can be revirsed with a simple switch.

Why would the poles be reversed? There is no reason for a charger not to have the correct polarity markings.

Get a $10 voltmeter and check the polarity if you still have doubts. The schematic ("electrical diagram") won’t guarantee the poles are not miswired.