I have never done this before but how do I get power to the Coin Door light (see below)?
Consider swapping the coin door incandescent bulb for a high-intensity wedge-base LED -- longer life, lower current draw.
If you use the
SATA to Molex splitter I mentioned in your other post, cut off the last Molex (upper right) and splice extensions to either the 12v/Gnd (yellow/black) or 5v (red/black) wires and run them to the tabs on the coin door lamp socket.
Euro-style terminals are a great choice for splicing the extension wires.
Your choice of soldering or 0.110"(?) Quick Disconnects for the socket connections.

Scott