in this case, yes, you can stick the ohmeter on the two coil lugs and if you get something around 15 ohms the coil is ok.

the reason you can do this without disconnecting a coil wire first is all the circuits on the yellow/red wire side of the coil are open ... or should be ... so there's no chance you are measuring a roundabout circuit path thru other devices.

having said that, the easiest thing is either attach one end of a jumper to yellow wire 30 that goes all over the place and touch the other end to the yellow/red wire on the coil. Coil should fire.

if you prefer not using a jumper, manually close the bonus score relay. The score motor should turn on and the switches daveh mentioned will pulse the reset coil for you.

if that works, your problem would be the bonus score relay isn't powering when it should.

5E and 8B are in parallel, it's not likely that both have an issue.

the stuff you probably care about is around G9 on the schematic.

1] you must have scored 10/100/1000 points so the ball index relay is being held powered

2] when the bonus unit is not reset, the bonus unit zero relay should be powered

3] when the ball lands in the outhole, the bonus score relay powers and bonus scoring happens

4] when the bonus unit is zero, the bonus zero relay unpowers and the outhole relay powers.

5] the ball kicks over to the shooter if not game over.

so before draining the ball, you should look and see if the ball index relay and bonus zero relay are powered. If not, you won't score the bonus.

oops, I misunderstood your issue. Sorry about that.

below is the schem for what daveh is saying. The red circuit doesn't work, and he's asking you in post 11 to see if the yellow circuit works. If yellow doesn't either, then almost certainly it's either the coil or the plug connection to the playfield (see "panel to cabinet" plug chart on the schem for wire 31-1).

oops (resized).jpg