[mike31154]

EDIT: OK, I posted this pretty much at the same time you found your solution. Good news & ignore info below... what kind of zappage are you intending to check with the voltmeter?

What brand of ballast is it? Model #, size of T5HOs & how many? I assume two lamps per ballast? Try other lamps if you have spares kicking around. Could be just a lamp. And if the ballasts have EOL (end of life) technology, when one lamp weakens, the ballast will generally shut both of them down.

I finally looked up Tek retrofit and the kits I found show them using Universal AccuStart electronic ballasts. If so, the wiring diagram looks fairly straightforward. My retrofit with Workhorse ballast requires jumper wires at the endcaps, but the diagram I found for the Universal ballast does not, much simpler actually.