A friend is having a weird breaker trip issue. Sometimes it happens when a light on that breaker is turned on, but sometimes it happens when one of the lights is turned off. This all started after a new dining room chandelier was installed. The chandelier has a 120V to 12V transformer inside the ceiling base with tiny little two prong 12V bulbs stuck into some of the chandelier branches. I did double check the wiring connections in the ceiling and in both wall switch boxes. I did find a loose wire to one switch, fixed that, but that did not solve the problem. I assume that it is a problem with the transformer or the chandelier's internal wiring. I don't have an amp meter to see how much current it is pulling. What puzzles me is with the breaker tripping when one of the lights gets turned off. As long as the dining room chandelier is kept off, no tripping happens.