If your house was a spec house when built then 9x out of 10 your outside receptacle is being shared with something else in the house. Determine what size breaker is feeding the receptacle next to the panel this one should be on a breaker by it self, if in fact it is on it's own breaker and by luck it is a 20A go out and get your self a 10 or 12 gauge cord and that should take care of what you need. If not I know the number of a good electrician
