I had the same issue. I did not want to wait so I cut into the unused 48v wires going to the playfield. Lights work great and are awesome! I took a few pictures if you're interested.

I'm sure someone will tell me I shouldn't do this, but its worked great so far. I did not contact stern and ask about what their fix was so I didn't want to tie into the existing node (1?) board power. I did unplug node board 1 and plugged the power into the expression node board and the lights worked perfectly. I spent a decent amount of time tracing wires and looking at unhelpful diagrams in the game manual. I decided the best option was the unused, switched, 48v power and ground wires going to the playfield.

I de-pinned a grey and a black wire from the connector and cut the wires so i could repair the harness if there was ever a need (selling the game, ect). I used spade terminals for the wire to wire connections, and some small terminals I had from some weather pack connectors for the connections I had to make at the node board. Heat shrunk all the exposed terminals and saved the little pieces of black and grey wire in case I ever want to un-do what I did.

To me it was worth cutting into the part of the harness that wont be used, I can understand others not wanting to do the same. There was just no way i wasnt going to get those damn lights working!

edit: If you could get a 2 pin Molex (or whatever the playfield power connector is) you may be able to avoid cutting the cabinet harness at all? I used what I had, I wasn't waiting any longer ha.

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No offense taken! I have faith in my soldering skills. I know pin-fit is tight and there is very little chance of having an issue with it. Like I said the two wires I cut plug into an empty hole in the connector. They can be re-soldered and put back into said connector. I've decided these games probably have hundreds of solder joints, I'm not going to freak about two more (that are not even carrying current). I made sure it's unpluggable and the playfield is still easily removable, but it definitely voided the harness warranty haha. Either way I totally understand the concern and I did think about how it would effect value.

It did not take me too long Tracing wires and deciding which circuit to use took me time, and I have a 150$ set of crimpers! Haha. It sounds like id still be waiting for stern to send me the "right part" going that route. If i had Molex pins on hand I most definitely would have used them. I could have put them directly into the playfield connectors open ports. If we are being technical is THAT even really "correct"? Its not how stern wired (some) of them. I just wasn't going to wait unfortunately when I knew I could get them reliably working. (You probably think i'm a hack )

Do you know what the connector is called on the node board side by chance? Not opposed to redoing it with more attractive parts!

Edit: There are also a lot of spade terminals used from the factory by Stern. (Start button, coin mechs, door switch)

I'm thinking the same thing on the jumper. And I agree it should be included. Was very frustrating spending a Friday night installing the lights just to find out I have no plug in my almost 7000$ (now) machine. That's why i wasn't going to wait. I'm not sure if there is an any 3rd parties making splitters? At the time I cut into mine, I could not find info on how stern was "correctly" fixing this issue so I was afraid to tie into existing used wires.