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Your question gives me the impression you are relatively new to the hobby. Welcome. First, I am assuming you want to wire two twin coil switch machines together (there are other varieties of switch machines). Snap relays are something else although the Atlas Snap Relay looks similar to the Atlas Twin Coil Switch Machine. The middle connection of the twin coil switch machine (TCSM) is the “common” connection. This should be wired (using a black wire) to all other “common” connections on your TCSMs and then to one of the “accessory” terminals on your power pack. This wire connecting all the “common” terminals together is called a “Bus Wire” or simply “Bus”. Connect the other two terminals of one TCSM to a momentary switch as you normally would. Next use jumper wires to connect the second TCSM to the first. Activate the momentary push button. If both TCSMs throw the way you want you are done. If one throws the wrong way, then reverse the jumper wires between the TCSMs. Activate the momentary push button again and everything should be fine. <br /> <br />A (snap) relay is used to connect power to a device and can be used in conjunction with the TCSM to provide power to a signal, for example. Good Luck. - Ed <br />
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