Quoted from DugFreez:SPIKE games don't have the 3 pin (G, +5, +12) connection that all SAM System games had. So that splitter (alone) wouldn't work on a SPIKE game.
You would need a SPIKE 12v Power Adapter (which makes it so the SPIKE games do have the familiar SAM 3 pin connections) and then use that type of splitter.
http://www.pinballlife.com/index.php?p=product&id=3723
I'm seeing 12V at this connector inside the coindoor. The pins are around the other way from the SAM one, but any problem using this?