It's one lead from the wall socket into a unit on the back of the canopy, this then splits the power as necessary to go off through the lights/timer/filter etc. Easiest just to get a new timer methinks...
hey if it's the timer i could have a look at it for u. i'm good at fixing electronic bits and pices (did it for a job once) jus email me and well sort something out.
Thought I'd check out the dates on this thread - cos the damn timer unit has gone awol again! Will be speaking to Hagen today, not impressed that the new timer unit has only lasted since last August. But of course, I've lost the receipt etc, so guess I'll be shelling out for yet another new one.