in the backyard there are three outlets. the first one has always worked. the other two did not (when we bought the house) we took off the face plates and found out that there were two sets of wires not connected. we assumed these went to the other two outlets so we connected them. This tripped the gfci switch. we reset the gfci and hooked up only the first non working outlet and it worked...didn't trip anything. however, when we hooked up the wires going to the next non-working outlet it tripped the switch again. Is it possible to have it overloaded in the series even if nothing is plugged in? or do you think the wiring going to the last box is damaged underground somewhere? there is cement over the wirng so it is hard to tell where they go. If the wiring is actually damaged, can it be replaced without ripping up the concrete? what would you do in this case? should we hire someone or is there something I can do myself?