Amazon will charge any card on your account to re-load a gift card not your default card!
Every time I have tried to re-load my card and get the rewards it has been messed up.  For some reason Amazon can not get this right!  I tried to re-load $200.00 to get a 2% reward and it would not go through.  I had to delete all the credit cards on my account and after several attempts they were able to charge my card.  Then they decided to charge for all the other attempts that they had previously cancelled.  Now I wait to get my refund for 7 days when they took the money instantly.  Not worth it!
Rating: 1 stars