Yes, everthing in the game goes off or blinking.
Check the relay in the back box if the wiring is correct.

I doubt it is a stuck contact on the relay.
All the yellow wires are connected together.
On my Blackout the wire from the transformer goed directly to the relay and then it goes to the fuse(s).
If only the playfield goes on and off someone must have messed with the wires.
If someone has indeed reworked the wires, it can be a stuck contact.

The connections to your relay are correct according to the manual
The red wire is supposed to be on 3J3-8.
This is also a solenoid power connection (see partial schematic).

Peter

Blackout (resized).jpg

Looks like 3J3-8 has a bad connection. As Inkochnito noted it's pin 8, not pin 9.

2048305948.png

Looking at that schematic above, it looks like 3J3 pins 6, 7, 8, and 9 are all 28vdc (coil voltage). Are you getting 28vdc at both sides of the relay coil?

Set meter to check DC voltage. If it's an auto-ranging meter, you won't need to select a range. Otherwise set it for the range closest to (but *above*) 28. Place and hold the tip of the black probe against the ground strap in the backbox. Place the meter's red probe on the solder lug of the relay with the red wire and note the voltage (should be around 28-35 volts dc). Next, place the meter's red meter probe on the solder lug with the brown wire and note the voltage there, should be the same (28-35 volts dc).

Note, some meter probes have adapters that can be placed on the end to make testing easier. I have an alligator adaptor i can place on the end of each probe to clip them to the points I'm testing. You may eventually want to consider a kit like this that includes various adapters to facilitate testing: https://www.amazon.com/AideTek-Multimeter-TL809-multimeter-tester/dp/B01MZGWHPU/ref=mp_s_a_1_9

Here are two images from my Blackout.
Please note that I modified the G.I. into 4 groups.
(2x 5A backbox insert, 1x 2A cabinet, 1x 10A playfield)
The 5V fuses are moved more to the right (above the transformer).
And I've added my Bridge Board insted of the bridge rectifiers and the big cap.

The second one if the connector at the power supply.

20200929_195016 (resized).jpg

20200929_195027 (resized).jpg

From the looks of your images there should not be anything wroung.
All the GI wires look correct.

I think you took a measurement between ground and the yellow or yellow-white wire.....
You can't do it that way.
There is no ground connection in the G.I. section.
You need to measure between yellow and yellow-white at all times.
Always AC voltage, no DC.

Those are the connectors at the "neck" of the cabinet.
One goes to the bundle which goes to the playfield.
One goes to the cabinet and the last one to the backbox insert.

Because of this I split the 20A fuse into 4 smaller fuses.
Seperating the G.I. to the cabinet, insert and playfield.
Less fire hazards.
20A can do a lot of damage when burning....