Chuck,
PS-2 2rail engines only pick up the DCS signal on the power side. If you frog isn't powered that's most likely what is happening. The new PS-3's can pick up the signal on either side now. With the PS-2's you have to flip the DCS-polarity switch to be able to pick up the signal on the other side.
Even though you got the full system you will need to power your frogs. It won't hurt but it will help.
Ralph
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