How many amps is your timer good for? One of mine stopped working over the weekend so I got a new 15 amp heavy duty grounded timer from homedepot for ~ 10$. I noticed some of the fancier digital timers were only good for 10 amps if that. My coralvue ballasts lack an on/off and also arc when you plug them in which I expect with such a big draw (and larger initial draw on firing).