No offense man, but you have a karma of over 11k and your buying games in bulk. "Here is what's wrong now somebody tell me what to do" is kinda a newb thing to do.

On the GI issue id check the plug about 10 inches from the transformer with the yellow wires going into it. Then check your fuses, fuse clips and the connectors on your PPB board and power supply board.

Fuse Locations.
Although this does not apply to every DataEast/Sega game, here is a run-down of fuses in many late model games.
Backbox Bridges, mounted directly to inside of backbox. F1= 8a slo-blo 32 volt (BR2) for +32 volt coils and the flashlamps. F2= 8a slo-blo 18 volt (BR1) for switched (CPU controlled) lamps. F3= 8a slo-blo 18 volt (BR3) for the score display (only on games with the large 192x64 dot matrix display, Maverick to Batman Forever).
Power Supply Board (in backbox).
F1= 7a slo-blo for +5 vdc (regulator input 9 vac). F2= 7a slo-blo for +5 vdc (regulator input 9 vac). F3= Not present on most games. F4= 8a slo-blo for 18 vdc switched illumination. F5= 4a slo-blo for 32 vdc low-voltage solenoids, bumpers, slingshots. F6= 5a slo-blo for 32 vdc for L/R Relay coils and flashers.
Playfield Power Board (aka PPB, in backbox).
F1= 5a slo-blo GI (general illumination), playfield. F2= 5a slo-blo GI (general illumination), backbox/speaker panel. F3= 5a slo-blo GI (general illumination), playfield and coin door. F4= 5a slo-blo GI (general illumination), backbox. F5= 5a slo-blo +50 volt for playfield coils. F6= 3a slo-blo +32 volt for flash lamps. F7= 3a slo-blo +32 volt for playfield coils/flash lamps Right/Left. F8= 4a slo-blo +50 volt playfield coils. F9= 5a slo-blo +50 volt playfield laser kicker (outlane return kicker).
Flipper Fuses on the Solid State Flipper Board (aka SSFB, mounted on side of cabinet, under the playfield).
F1= 3a F2= 3a F3= 3a F4= 3a F5= 3a game).
Main Cabinet
slo-blo +50 volt for lower right flipper initial power. slo-blo +9 volt for hold power. slo-blo +50 volt for lower left flipper initial power. slo-blo +9 volt for hold power.
slo-blo +50 volt for upper right flipper (if game is a 3 flipper Power Fuses (near the coin door).
8a slo-blo (domestic). 5a slo-blo (international).

Your GI goes from your transformer to the power supply board, through a relay, then on to the PPB board. Its most likely a bad connector(s) somewhere along the line, a fuse or a fuse clip. Reflow the solder on all the associated header pins while your at it.
I follow what jalpert is saying. This is al easily goggled info. The trick isn't always knowing the info, its knowing where to find it. But I don't mind helping out.