Beverley&Ken wrote:
On the GFI plug, on set of wires (white and black) should be marked on the case as being 'Load', this pair would feed the downstream GFI protected outlets. If the GFI resets, then the problems is in one of the downstream outlets, outside or in. You will then have to check everyone for moisture or a slightly loose connection.
Ken
You really do have to watch the in/out thing very closely because they changed which wires do which job. So if you just replace a GFCI and wire it exactly as it was, you may have the in and out backwards. On the new GFCI's that will cause it to trip. The old ones would work fine backwards but have no protection.