The yellow wires are general Illumination Looks like that MPU board has a significant amount of battery leakage. The driver board is a later model, hence the connector not able to plug in.

^^ everything Chad said is correct.

Your driver board should have a relay and a molex for the flippers. That board is from a 1992-1995 machine.

And yeah - looks like that CPU board is toast!! Severe acid damage.

rd

I don’t have my Gilligans in front of me but:

This one will likely connect to the transformer (via the loom in the cabinet)

39FABB12-DF81-46DD-BC74-D10EFC198FB2 (resized).jpeg

This one - not so sure - it could well connect to the knocker in the top left corner of the headbox (but check that first!) or it could simply be spare (it happens) Find another Gilligans machine owner to compare with.

4CF1DAA6-D216-4D89-938E-8B9AD22AAD5B (resized).jpeg

The Gilligans manual isn’t very good - I know from experience, I rebuilt mine from a wreck as well.

rd

MPU board is toast. X
Driver board is the wrong one. X

Ooof.

GI to back box?

I hope you got a screaming deal on this Gilligan's Island. If not then the seller took advantage of you.

• As noted the CPU board is toast. It looks to be original to the game (20003). Don't bother trying to repair that board (or send it off for repair). It's not cost effective. Just get a replacement board. There are many manufacturers of a replacement for this board.
• Also as noted the Power Driver board is incorrect. This board looks to have come from a No Fear. There is NO WAY this machine worked properly with that board in it. You can populate the flipper relay section of this board to restore functionality. Otherwise you will need to find a "-1" revision of this board. A repair technician should be able to populate the flipper relay components or there are a few manufacturers of a replacement for this board.
• J120 is missing. It looks like the wires for this have been connected directly to J121. This is electrically functional but not factory. You will need to undo this and re-create a connector for J120 if you want to restore this to factory.
• The bundle of YEL/YEL-WHT wires are connected to J115. This is GI transformer secondary. The manual documents the wiring for this if you want to restore it to factory. You will have no GI unless you re-create this connector.
• The two RED wires are connected to J101-1 and J101-2. This is the 9VAC transformer secondary for the 5V digital logic. If you don't connect this then nothing on the machine will work as you will have no 5V digital logic.

I'd call that a screaming deal.

j101.jpg

You will have to pull the wires out of the IDC and any of the following:

• Insert new wires into the IDC and use a 2-pin Molex 0.093" housing.
• Cut the wires out of the Molex housing and insert them into the IDC.
• Cut the wires out of the Molex housing and use a new 7-pin housing.
• Do something else to restore the connection.

There are no phase requirements and no polarity (AC) so the red wires can go either way.

Sometimes the manual can be pretty handy for these kinds of questions.

You can find the manual here:

https://www.ipdb.org/files/1004/Bally_1991_Gilligan_s_Island_Manual.pdf

In particular, look at pages 107-110.