VHO flicker

[Delphinus]

Thanks for the info. I think it's a Magnetec ballast, I'll have to look at the sticker again to be certain. It's a pretty heavy beast, looks just like a typical fluorescent ballast just about 3-4 times larger.

A loose wire. Hmmm, could be. I'll do the wiggle test as you suggest.

Who makes this Workhorse ballast? Can I just go to any lighting supplier and ask for one, and hope that they know what I'm talking about?