Checked your fuses? What voltage is at the lamps on their common wire?

Check for stuck switches and bad diodes on the second to last column of the switch matrix

If you can start and play a game, that means you're getting seven flashes. There should be one flash, then a long pause, then six more, for seven total.

To check a fuse with a multimeter, set it to the continuity testing mode and put one lead on each side. If there's continuity, the fuse is good. If you don't have a continuity testing mode, use the ohms / resistance mode, and if you get a reading less than 10 ohms, the fuse is probably good. The fuse should read similar to what you get if you just touch the two leads together

Check your f1 fuse on the rectifier board- this is tied to the controlled lights.

If f1 is good, I would suspect your J1 and J3 plugs on the rectifier board. Make sure the pins are all the way into the housing. Inspect the header pin solder pads on the back for cracked solder joints and reflow as needed.

Checking that you have voltage at both ends the fuse, then check at the lights, then if you have it at one and not at the other, follow the line back until you find the problem

Probably connector problems at the rectifier board.

Check out great plains electronics. They'll have everything you need (housings, pins, header, crimper). Probably not in one easy package, but it's fairly straightforward (you need an eight pin .156" molex connector) and if you've got any concerns send them an email and they'll set you up right

https://pinside.com/pinball/forum/topic/vids-guide-quick-bally-driver-board-repair-bulletproofing/page/2#post-2113931

That's probably it. J1 pin 7 is the +5.4 vdc Switched Illum. Buss.

Get this crimper. It's ratcheted and makes crimping pins much easier than the non-ratcheting ones you'll see.
https://www.amazon.com/gp/product/B007JLN93S/ref=oh_aui_detailpage_o00_s00

Big Daddy has a kit with all you need in terms of connectors and pins. It may be J1-7 but if not it's probably another pin. This way you have all you need to repin everything.
http://www.bigdaddy-enterprises.com/repairkits/bally_kits.htm#b-ps18conn1

(Marco also has a kit, http://www.marcospecialties.com/pinball-parts/CKBLY, no $30 minimum order but it looks like it lacks the key pins. http://www.marcospecialties.com/pinball-parts/CKBLY)

You'll also need a wire stripper/cutter, available at any Radio Shack or decent hardware store.

while you are in need to cut wire,you like to pick from a list of best wire strippers.It is exactly that what you are looking for with individual reviews. smartkitchenpicks.com/best-wire-strippers

To check a fuse with a multimeter, set it to the continuity testing mode and put one lead on each side. http://smartkitchenpicks.com/best-wire-strippers