Picked up my first pinball machine this weekend, when testing it out at the previous owners house everything was working fine, however some issues have popped up after transit and during setup. Pretty much everything is still working as intended, the biggest problem at the moment is that when the last ball drains, in this case after five balls, the "Balls in Play" on the backglass disappears and the ball is ejected back into the shooting lane. This effectively makes the game go on forever as the game over relay is never tripped. This happens no matter how many players are in the game and the player counter works as intended. If you manually trip the relay, the game over light comes on, and you can begin another game by pressing the start button and everything resets properly.

Here is a breakdown to recreate the issue starting from a fresh game:
Press start button > Scores reset > Ball ejected into shooting lane/Balls in Play goes to 1
Launch ball 1 > Drain ball > Ball ejected into shooting lane/Balls in play goes to 2
Repeat until ball 5 is shown on the backglass
Launch Ball 5 > Drain ball > Ball ejected into shooting lane/Balls in play lights go out
Repeat forever until game over relay is manually tripped

At this point under the playfield the ball count unit disc is in the position that is listed in the manual as "trips game over relay in 5 ball game" (Seen below in red). From what I can tell the BLU-R wires are intact and go to their listed positions at the Lock Relay and Game Over Relay. Does this sound like the coil somehow went bad during transit? I went ahead and cleaned both the disc and the arms to ensure there was contact, but that did nothing. I did not touch the 3/5 Ball Adjustment Jack as it was not touched during transit (also I don't know where it is). The head and playfield were both removed to make moving the machine easier, no pinched wires are visible, and the jones connectors were removed/replaced multiple times to ensure the connection was good.

Since I am new to owning pinball machines, maybe I'm missing something in the manual or schematics, but since everything else is working as intended, the only thing I can think of at this point is that the coil is dead as it does not appear to be activating at all when it's supposed to (no noise/heat). As a reminder, the game was acting normally the day before at the previous owners house. If any additional information or pictures are required to help diagnose the problem, let me know where to point the camera and I will supply them.

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No, the game will remain in whatever state it was in prior to turning the game off using the toggle switch.

I do not, I ordered a set and will report back tomorrow. Are there any other tools you'd recommend I have on hand for repairing machines? I have a multimeter and of course screwdrivers, socket wrenches, etc. Speaking of the multimeter, I did try to do an ohm test on the coil, however I couldn't get it to give me a reading, I was probably just doing it wrong though as I couldn't get it to work on any coil, including the known good ones.

Okay so, got my alligator jumper wire and good news, the trip coil is not dead! It did activate when power was supplied. Bad news, that means it's something else. If I try touching the blue-red wire on the ball count unit with the jumper it does not trip the game over trip coil either. Not sure if that's intended because some other switches are not active, but it's something I tried.

I went through and gave every wire connected to the unit a tug, they're all solid including all yellow wires. Here are pictures of each side. From what I can tell everything is there.

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So before I head to bed for the night, I was able to trace the wire and confirm continuity along the whole path after messing with the plugs a bit. When I tap the jumper along any point of the path it will trigger. However it's still not being triggered when the wiper arm reaches the final position. I'll fiddle with it some more tomorrow after work, just giving an update to the situation for record keeping.