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light fitting not working?

how do i test my kaoyi transformer model no ktb-210a, there seems power to the 15 bulbs but none of them work.
JOHN, October 2014
replace the tranny

gts, October 2014
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