My son just recently bought a house, an old one, like 1900. It has been worked on a number of times including prior to his purchase. The renovation was done by a licensed contractor.My son called me to come over and see why an outlet in the bedroom would not work. In fact it did work, only when using it with a fan or a light, it would only give a portion of the power to the original demand (the outlet) and send the balance to the ceiling light. When the fan was pluged in and the switch rotated thru the speeds the light on the ceiling would act as though it were on a dimmer switch only at a portion of the wattage. It tested 120 volts, my guess is the amperage is getting split and sent to the next destination. How would that happen??? I am not sure if the power comes to the outlet 1st then the light, or as in some older homes from the light to the plug. Its new wiring and we checked the light and plug and it all looke fine. Would a 3 wire prior to the 2 sources be the culprit?? I think its haunted!!!! This one has me scratching my head.