if you are not staying on site at universal but driving to the universal parks from disney, you will have to pay for garage parking.
once you have an activated AP, free parking.
to avoid paying the parking fee at universal, have your husband drop you off go then to have your ap voucher processed. (he can go to the little strip mall down the street and wait there until you call him.)
when that has been completed, call your husband to return and get you.
you can then go with him to park the car.
with the actual AP, your parking fees are waived.
most people do not do it that way.
they park in the garage, pay the fee.
once they have processed the voucher and get the AP, they use it for all future parking needs then.