Hi Jeffcox007
I am not familiar with ONE-Player pins. To Your post-6: See the JPG - we toggle-on the pin - the Tilt-Light is lit because the H-Relay is not yet pulling (all good), the Game-Over-Light is lit because the R-Relay is not yet pulling (all good). From the lights on the Ball-Count-Unit we see: The Ball-Count-Unit has an ZERO-Position - this ZERO-Position shall be reached - then one step shall be done to Position-1 is "Ball-1" is in play. - Interesting I see a "Position-6 is "Game-Over-Position for an 5-Ball-Game".
See on the lower part of the JPG - starting a new game does actuate the Replay-Counter-Step-Down AND the "Reset Ball-Count-Unit". Toggle-off Your pin, unplug the main power cord (Safety Reasons) - manually step Your Ball-Count-Unit to somewhere in a middle position - also manually put some points on the Score-Drums. Then plug-in, toggle-on, start a game - when the Replay-Counter is stepped down by one - DOES the Ball-Count-Unit RESET ? I guess the Score-Drums do reset - then: Is the Ball kicked-over to the shooter alley ? - If not (but the motor was nice and friendly, did stop): "work" the ball (kick it over) under the apron over to the shooter alley - DOES the Ball-Count-Unit step-up ? See here https://www.ipdb.org/showpic.pl?id=2457&picno=29009&zoom=1 - on the way from the Outhole to the shooter alley the ball closes a switch (see switch in the upper right corner of the picture) - the TROUGH-Switch - closing this switch makes the Ball-Count-Unit to step up - in our test step-up from Position-Zero to Position-1 is position to play the first ball. Greetings Rolf

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Hi Jeffcox007
the Ball Count Unit out of adjustment ? I have taken Your picture (post-10) and show it here together with the schematics (lights) --- I can identify for sure Position-2 and Position-4. I believe to see (encircled blue) a way to adjust the unit.
On the round bakelite plate I count six rivets --- the schematics has positions "one" through "six" so the "Position-Zero" is a step before Position-1. Have the Unit fully resetted - can You adjust / turn a bit the somewhat rectangular looking bakelite plate by just loosening the three screws ? Greetings Rolf

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Hi Jeffcox007
see the JPG - along "green lines" the O-Ball-Return-Relay should pull-in (as encircled green switch is thrown) - the O-Relay then establishes "Self-Hold-Current" by closing "encircled blue" switch --- the pulling O-Relay makes the motor to run and "encircled orange, orange wiring" the Outhole-Kicker (named Ball Return) should kick the ball over to the Shooter Lane.

Wear rubber gloves or use an wooden stick (electricity can kill people) - start a new game - when it comes to the fault: Lift the playfield - (wear rubber gloves or use an wooden stick) - press the armature on O-Relay and let go - DOES the O-Relay stays pulling for a while ? does the motor run ? - does the Ball-Return-Coil fire ?
IF (if, if) The O-Relay does not stay pulling after You have "pressed, let go" the armature on O-Relay: There is a problem in the wiring - most likely in "my encircled red" switches. Greetings Rolf

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Hi Jeffcox007
see the JPG in post-13 - on the right, You have manipulated /pressed the armature on O-Relay --- the O-Relay stayed pulling (did it - does it ?) for a while and the pin kicked the ball over to the shooter alley --- because the O-Relay did stay pulling we can clue "the marked green wiring (specially the switches in the wiring) is good" --- but in the JPG on the right, upwards comes a switch "Zero Pos. Ball Count Unit" with wire-SL+RED-slate-mingled-with-red, wire-red-yellow. This wiring upwards goes to flipperbats etc. Look on Your Ball-Count-Unit for this switch (most likely a two-bladed leaf-switch operated by a rod mounted on the gear) - switch open or closed ? Greetings Rolf

Hi Jeffcox007 +
I show the JPG from post-13 again - enriched --- see "marked green" wiring: In a running pin here Initial-Current flows - the O-Relay pulls-in, actuates all its switches - so "encircled blue" switch on the relay closes - establishes Self-Hold-Current along "marked blue" wiring.
I asked You to (manually) press the armature on O-Relay and let go - does the O-Relay stays pulling on its own for a while --- if "YES": We can clue "wiring marked blue" is good, working" - for to chase on the original problem (see the JPG) - on the right, upwards "marked brown", connection to flipperbats etc. --- the next stuff to look at is (encircled brown) Switch-Zero-Pos-Ball-Count-Unit" - then (encircled brown) Switch-on-H-Relay.

in post-16 You write +/- "maybe mechanical problems not proper stepping (?) --- see the JPG, "my grey stuff" --- we toggle-off the pin, unplug the main power cord (Safety Reasons) - clip-on a Jumper-Wire at the stepper-coil, side wire-blue is soldered-on. take the other end of the Jumper-Wire near the 15Amp-24VAC-Fuse and lay the end of the Jumper-Wire near the fuse, lay on wood - the bare end of the Jumper-Wire shall not touch metal. We then plug-in, toggle-on, hold the Jumper-Wire on its insulation - tip-on the bare end of the Jumper-Wire onto fuse SIDE-WIRE-RED-YELLOW* is soldered-on and immediately pull-off - does the stepper fire - step ?

SIDE-WIRE-RED-YELLOW*: Doing so we do have the FUSE in our circuitry - safety reasons.
Greetings Rolf

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Hi Jeffcox007
You did a great find - the so called trough switch - in the schematics of Sure Shot at "F-11" --- it triggers the "Add Ball Count Unit".
"Spring on Ball Count Unit" --- shown in the last picture in Your post-19 --- I hope another pinsider chimes in and writes about "buying at pbr - http://www.pbresource.com/ " - I live in Europe, have never bought from pbr --- I mostly use parts from parted out machines or do buy stuff in a local hardware store. Greetings Rolf