turn on the power switch and the "general illumination" lights should come on ... the playfield lights and some behind the backglass.
if you add some credits to the replay register manually, then turn on the game, the credits should get removed.
when the game is on and sitting there with 0000 credits, you need to either flick the coin switch or use a key to turn the lock on the side of the cabinet repeatedly to add credits.
the manual and schematic can be downloaded from http://bingo.cdyn.com/machines/bally/miss_universe/ in the red "resources" box.
if you can post (email to email@example.com is even better) the highest possible resolution pictures of the paper tags inside the head and the reflex unit wipers (with enough wiring in pic to see the wire colors), that would be great. Reflex unit is bottom of back door.
email as many pictures as you like.
the best pictures are ones you can zoom in on and read the labels.