There's very probably a break in the return path - for the power to work it has to flow out from the source - through the load (bulbs) and back to the source.
If you have power at the bulbs then the outward path is good - look to the return.
Many Happy Returns...
Humpty Dumpty
October 2014
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
