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Sean, The MRC power supply is + and - 12vdc<blockquote><blockquote>MRC Tortoise Switch Power Supply Slow motion or latching switch machines add to a layout's realism, but until now, you needed two DC power supplies for the +12/-12 dual voltage. Now, all you need is one Slow Motion Switch Power Supply and hook-up is quick and simple. </blockquote></blockquote>Your Tortoise instructions should have included the wiring section which discusses the following:<blockquote><blockquote>2. BI-POLAR DC WITH SPDT SWITCHES: This system requires two similar DC supplies of not more than 12 volts each. They are wired in series with the (+) of one supply connected to the ( - ) of the other supply. This common connection feeds a bus wire that runs around the entire layout. One of the motor connections from each TORTOISE connects to this bus. Single pole switches connect either the (+) supply or the ( - ) supply to the single wire that runs from the panel to the remaining TORTOISE motor connection.  This system offers simplified wiring and the use of lower cost SPDT switches for control. This is offset slightly by the increased cost of the two supplies. See Diagram 2 below.</blockquote></blockquote>The only difference is that the single MRC power supply does the same thing as the two individual power supplies shown in the Tortoise drawing.  You only need to use one set of contacts on your DPDT switches that you already have (essentially just SPDT).Your MRC instructions should say which wire is which (by color I assume):  +12vdc, -12vdc, and common.I hope this helps. -Johnp.s. Here is a PDF version of the Tortoise instructions:<a href="http://www.tonystrains.com/download/man-tortoise.pdf">http://www.tonystrains.com/download/man-tortoise.pdf</a>
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