Ballast Pump

[Dannad]

Just wondering if anyone has run into problems with their ballast pump (There is only 1 pump, right?)
I filled up all 3 ballasts on the weekend then when I went to empty them only 2 emptied. When I flip the switch on the third with the other 2 off there is no reaction. No pump noise, nothing.
Is this most likely a wiring problem? Would the wiring problem be right behind the switches or where is the next place I look for wire connections?
Thanks for any input.
Dan

[Dannad]

OOPs. This post would be more suited to the Service section. I will repost there.