Finished cleaning the steppers and reels, checking wires, and scrubbing connectors. Put the head on and fired it up.
I turned on the toggle and then hit the left flipper - playfield lights came on, motor turned, but nothing else happened. No lights on in the backbox.
Turned it off, pulled the backbox connectors and reinserted to make sure they were seated. I manually reset the score reels to all 0's, then turned it back on. Nothing but PF lights and motor turning again.
Tried adding a credit by the coin door switch, 0.25 relay fired, but no credit added. Went to the backbox and flipped the credit switches manually, hit Start and a bunch of stuff happened. I triggered the pop-bumpers, drop targets, slingshots, all on Player 1.
The scores reels were going a little crazy, several player reels turned at once. A loud buzzing started and started to smell like hot electricity (kinda like burning).
Turned the machine off, unplugged main, checked relays, manually moved and reset steppers, clicked through score reels and checked connections.
Plugged back in, turned on switch, hit left flipper, added a credit on the credit reel, hit Start 4x. A bunch of clicking and whirring. Hit PF targets, scoring seemed better and accurate, tripped End of Ball / drain switch (to move to the next Player), hit targets, repeated for all 4 Players.
I tried to go through all 5 balls per player (by manually switching the drain switch), but the game never stopped.
Turned off, back on, hit L flipper, hit Start, all the score reels and steppers reset (yay).
Still, only one light on in the backbox, have to manually add credits in backbox, one of the rollovers causes a very loud whirring and hot electric smell until disengaged by hitting another rollover (down post), the "B" drop target sticks.
I'm glad it seems to work a little better now, but the weird thing is I have no idea what I did that made it run better.
Still need new bulbs, left flipper parts, and I need to figure out what that buzzing / burning switch is doing. And I need some pinballs too, of course. Ordering soon.