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Does any know the wiring diagram for the 4 pin connector located on many of the Railking PS2 F-3 powered A units? 

I have several of these with Non-powered A units and would like to move the remote coupler as well as the directional lighting and/or interior lighting to the dummy. I think GGG posted a few years ago about this but haven't been able to locate the thread or any other source for the info.

Thanks!
H1000

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It would be best to open the engine and trace the wires.  Most likely on is Purple Positive voltage, and the other 2 are Reverse light and coupler off the 12 pin connector.  Could be 2 PV but you only need to bring 1 PV wire over and share it with the coupler and lights.  That leaves one spare which could be Interior light, or number boards if the engine has those.   The dummy A coming with the set should have a tether to connect to the Lead A.  No?  G 

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