The resistance you measured is likely the resistance from points A to B through the transformer and motor winding, not through the path you highlighted.

When the motor is stuck running, has the A/Reset relay reset or is it still in its tripped (still resetting) state? It could be that your A relay is still unreliable. If that's the case the motor is just the victim and you need to sort out why the A relay won't reset.

/Mark

Gottlieb schematics are usually drawn with the game fully reset, ready to play, ball in the shooter lane, and then unplugged. In your case the A relay switch in the Score Motor circuit should be closed while the game is resetting (A relay in the tripped position) and open once reset has completed (A relay in the latched position).

The A relay coil with the brown+white wire is the trip (or unlatch) coil that fires first, at the beginning of reset. The coil with the blue-black wire is the A resetting (or latch) coil that fires once reset has completed.

I think you've got your terms tangled up. The manual doesn't use the terms "latched" or "unlatched" that I can see. Ordinarily the A relay is latched, or waiting around to start doing its thing. At the start of reset the A relay coil fires which trips or unlatches the relay which means that the A relay is doing something (like running the Score Motor). Once the reset sequence has completed the A relay is itself reset or relatched with its own A relay reset coil.

Think of the A relay as a trip relay alone in its own trip relay bank. The A relay coil trips the relay just like a trip relay coil would. The A relay reset coil resets the relay like the reset coil of a trip relay bank would. The only real distinction between trip relays (or drop targets) and interlock relays is that trip relays have to share a common reset coil while interlock relays have their own dedicated reset coils.

Your A relay is not resetting reliably which is a common problem with many causes. I would start with the easiest remedies and work your way toward the more complicated ones. You know that the A relay reset coil is getting a pulse but there's a small chance that the pulse is too short or too weak. Checking, cleaning and maybe adjusting the Score Motor switch that sends the pulse would be an easy place to start. After that try cleaning the two armatures where they rub against each other. Next maybe try removing the one armature that comes off easily and try cleaning or polishing one or both armatures. Swapping in a new armature might help if the two armatures have developed a wear spot between them. And so on. There are lots of topics about intermittent interlock relays here. Search for "AX relay"...