Bally Future Spa Issues

So what is not working?, It sounds like the game is coming up. When a Bally game comes up it kicks out all the ball locations like the saucer and kicker in case a ball is stuck there. That's part of the boot. Afterwards the LED on the MPU flashes dimly which sounds like your B&I (that's the official name of the Weebly board) is doing. Are the displays lit up? Can you press the self-test button on the front door and put the game in test mode?

Disconnect J1, J2 and J3 on CPU board (only J4 connected) and see how many flashes you get. If you get seven, reconnect connectors one at a time to see what's causing the holdup.

Congrats on all the connector rebuilding. That's a lot of pins. I hope you drank several beers afterward.

If the MPU diag LED goes to half brightness and stays that way you have passed all seven of the MPU's power up tests. When the MPU diag LED blinks there is a delay between test flash one and test two. When you first power on the MPU the LED turns on briefly and then goes out. At that point is when you start counting flashes. After flash 7 the LED will remain dimly lit at all times for all bally/stern games except for a few exceptions like Flight 2k (not future spa).

I think it raises the drops and kicks out holes at power on so it sounds like you are actually in attraction mode but the lamps are out and the displays are out.

Start at the transformer/rectifier board. The 3/4a fuse is for the displays. Then 10a fuse is for the feature lamps. Check those fuses and see if the connectors look like they are burned up. With a DMM you can very carefully measure for the high voltage (and lamp voltages) starting at the rectifier board.

Is this a multiball game? Or better question, does the B&I board think it's a multiball game? Bally games with more than one pinball will boot and not come on line if a ball is missing. So first thing I would do is check the MPU and make sure it's set for Future Spa.

Once you confirm the B&I board is set properly for FS put the game in switch test and make sure there are no stuck switches and make sure all the ball rest spots like the outhole are registering when a ball is there.

good visual inspection of the backbox light board. They are usually two strings of bare wires going around to each lamp stapled to the wooden board. Look for any problems like crossed over wires or evidence someone in the past messing around with wiring. Its possible for the little spring thing in a center of lamp socket to break, fold over and touch the barrel creating a short. Possible a bad lamp could be shorted. I would pull all the lamps out. If you having trouble finding the short and getting desperate, break the GI into sections to narrow down where the short actually is. Someone could have wired up the J3 rect plug wrong too. Very common to see the GI wires hacked around burnt connectors.