sparkync:
The 'E' ballast has an internal battery that provides reduced illuination from 1 or possibly 2 fluorescent lamps in the fixture, and should be on a 'nite lite (24/7) circuit, usually with any exit or other egress lighting.
Are you sure you were not 'reading' the 90 volts on the output?? (From the battery component)
IMHO, these ballasts are a PITA, but you have to live with it. You could find the wiring schematic at 'Dual-lite' BUT you need the model # from the ballast.
