pics from a bit further back is better ... they are high enough res people can zoom in, and seeing the entire relay helps.
your wiring doesn't appear to agree with the schem I have, but it's a little hard to tell for sure.
the schem says the relay should have the following switches:
- NO : GR to WH-SL : the hold switch for the relay (schem F4). Should be the switch with the odd extra blade and no wire on one blade
- NO : YEL-BL-RED to BLK & RED : one way to power the M relay (schem E7)
- NO : BLK-RED to BLK & RED : in pop bumper sequence relay circuits (schem H-6). BLK & RED is same wire as above switch, so probably a bare wire connecting the two blades.
Note BLK & RED has about equal amounts of the colors, while BLK-RED is mostly black with a red tracer. Red may look pink/white due to fading. Gottlieb later used BLK + RED instead of BLK & RED.
- NO : SL-BLK to RED-WH : score motor power circuit. RED-WH wire is the same wire that's on the 10A fuse, but it could look different if it faded more/less.
- NC : YEL to WH-GR : in circuit to A relay (schem E4). That looks right on your relay.
if nobody posts a pic, I'll take one of the D relay on monday night and post it tuesday morning.
the bare jumper is probably factory, but the wrong wires are on the blades it's jumping together.
you can't really poke the circuits with a voltmeter and see what has 25V and what doesn't. The game is wired with one side of the 25V loads (coils, score motor) all connected to the black wire from the transformer, and all the rest of the circuits are getting the red-yellow wire from the transformer connected to the other side of the load to power it.
if you have one meter probe on the black wire, you will see 25V in many places if you randomly poke circuits. Specifically, you'll see 25V on pretty much every switch on the D relay at one time or another ... depends on what other switches are doing. You have to look at the schem to see what wire matters for the circuit you are debugging.
oh, and you are getting 29V because either the hi-tap is being used on the transformer (if there is one), and/or because the schem was drawn assuming 110V or 115V and you have 120V, so the voltages are proportionally higher. It's normal.