BALLASTS are high voltage,and I do not believe you can test them with normal"VOLTOMETER" testing equipment.
The first step is to get a new light and see if it works,if it does not work,then it may be wiring.
One sign I have seen for a bad ballast,and I just recently replaced the one on my coralife,is the light will "FLASH" for a second then nothing..If your light does that,then it is the ballast,if it does not flash,or anything,it COULD be the bulb,but probably the ballast.
So you are back to the first step..Get a NEW BULB and try it.
Originally Posted by macclellan
The Advanced ballast is slightly more advanced than the Workhorse ballast, although not quite as much of a workhorse...