I am trying to help a friend get his JITB up and running. Before I looked at it, my friend told me that both pop bumpers weren't working and he sent me a picture of both coil assemblies. These things were beyond fried, so I ordered 2 new ones. He said that when he first got the machine several months ago, it was working fine. Then, each time he hit the right pop bumper, the game would tilt. He kept on playing like this until one day when he hit the pop bumper, it popped a fuse. After I replace both coils, I had to center the motor manually, since the game was stuck in tilt. When I powered up, everything centered and went back to normal. On the first game, when I hit the right pop bumper, the game would tilt. I re-set the game and when I hit the left pop bumper, it acted dead, even though the switches were properly adjusted and cleaned. The next time I hit the left pop bumper, it caused the game to tilt. So here I am now. Two new coils installed and each time either pop bumper is struck, it causes the game to tilt. All of the tilt switches have been checked and cleaned, so nothing to report there. There was some buffoonery with the wiring around the roll tilt, as two "new" plastic coated wires were protruding from the wire bundle and black-taped together. All of the original wiring is cloth-covered, so I suspect that this may have something to do with it.
Any ideas? BTW, I am not good with reading schematics, so I have no idea what all is common between the pop bumpers and tilt.

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What about the coin door? I thought it is supposed to be closed.
Do you have any ideas on the hack job pictured? What is the purpose and what should I do about it?
Thank you for your help!

The tilt switches are a non-issue, as the blades are pulled far enough apart, except for the coin door. I am very unfamiliar with the operation of an EM, but I have quite a bit of experience with SS and WPC machines. Could the issue be the relay, and if so, where is it located? All of the paper legends are missing, so I have no idea what is what. Unfortunately, I do not have the machine at my house, so I have to go to my friend's house, several miles away.

Bump. Still looking for help with this.

Sorry for the late response. The game will play fine until either pop bumper is hit, then it goes tilt. Tilt is shown on the backglass. I will get back to you all on the "T" relay. Thanks for all of the responses!