Earlier WPC games required connection at J110 for the flippers, and later games the flipper relay was removed along with J110 and some other components.

Sounds like the wrong driver board is in there. I don't have a Gilligans, I think you have a -3 board in there instead of a -1. Probably should wait to have someone confirm this.

A-12697-1 (5763-12405-00): the driver board used from Funhouse to the middle production of Twilight Zone. It has a flipper enable relay on the board. Can be used on all WPC games from Funhouse to WhoDunnit (the most versatile non-WPC95 driver board, can be used in any WPC-89 or WPC-S game). On Fliptronic games (Addams Family and later), the flipper relay is ignored by the game's software.

A-12697-3: Used starting mid-production of Twilight Zone. The flipper enable relay is not installed (since these games have Fliptronics boards, and no long need the relay). Can be used on Addams Family to WhoDunnit. Can *not* be used on Funhouse to Hurricane because of the lack of the flipper relay, which is needed in non-fliptronic games (games prior to Addams Family).

Gilligan's Island is NON fliptronic. I'm fairly sure wayout440 is correct. You can also check the serial number stickers on the boards to see if they do or do not match. Odds are good that this board's number is different.

You can populate the board with the missing components:

http://blog.myhomegameroom.com/?p=220

Or just buy a -1 and keep the -3 as a spare for a future project or sell it.