I am a bit puzzled here. Why don't you just run the turnouts off of the DCC track power? It is a constant 15V so the voltage is adequate. Unless the manual that came with the turnout specifically says not to power them with DCC I would just try it.
Vernon Barry's suggestion [see above] solved the problem. But I will try running the turnout off DCC track power alone and let you know if that works too. Thanks, Tom!