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You need new header pins and connectors. It's important to pair up the wires correctly. One pair of yellow/violet wires will be shorted because they are connected together at the power supply board. The other pair of yellow/violet wires go to the playfield and should not be shorted. Now I don't know which pair go to which side of the relay contacts, but it doesn't really matter so long as the pairs stay together. For example, put the power supply yellow/violet pair to the two COM terminals. Put the playfield yellow/violet pair to the NC terminals.
Oh and before doing any of that you should go to the solenoid test and verify the the relay actually clicks. There should be a test entry that says something like "Playfield GI".
Also, there's an identical relay on the back of the insert panel that flashes the insert lights. There's another entry in the solenoid test for that. So you can watch the insert relay and lights to get an idea of what the playfield is supposed to do.
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