Hi goldenboy232
Look-up the area in Your schematics --- the wiring to R-Hold-Relay. I marked red in the snippet of Fast Draw the switches to look at: A Slam-Tilt-Switch (with an weight mounted on a switch-blade) on the Coin-Door - one in the Backbox (?) and one in the cabinet (?).
Here http://www.ipdb.org/showpic.pl?id=1893&picno=25929 in the picture in the lower left corner I see an weighted switch. Coin-Door: http://www.stevechannel.com/tiltmechanism.htm - the THIRD picture (attention: The fourth picture is NOT a typical Slam-Tilt-Switch as the switch in the fourth picture is normally-open). Backbox: Here http://www.ipdb.org/showpic.pl?id=1893&picno=25925 I do not see a slam switch in the backbox --- check Your schematics for "Lightbox Tilt-Switch".
Also to check is the "Self-Hold-Switch on the R-Relay": A short wire runs from one side of the coil on R-Relay to switch mounted on the R-Relay - THIS switch.
pinhead52 writes in post-3 about the Backbox-Slam-Tilt-Switch in his Big Indian.
Again Backbox - here http://www.ipdb.org/showpic.pl?id=2459&picno=46682&zoom=1 - upwards on the right - in the shadow we see the Lightbox Tilt Switch.
Want to try (?): Start a game - wait for the ball to come - then with a fist bang on the Coin-Door --- question: Do You get the Tilt ? Greetings Rolf