I just installed a new light fixture on a breaker that has never been used before. (We are running power out to a building.) Immediately after plugging in a light, it blew and threw the breaker. I switched the light switch. I plugged the light up to where it just went to the breaker. Still blew. I switched the light fixture entirely. Still blew. I switched the breaker. This allowed the light to stay on for a few minutes, but the light was unusually bright and blew shortly afterwards. What am I doing wrong?