Here is a link to what we use:
http://gadgetgangster.com/find-a-pro...projectnum=206
You need to lower the value of the output current limiting resistor then it works great.
I suggest you add a current probe to your test rig so you can measure current while you are testing your systems. A 10 gauge wire 12" long works perfect. Use that wire as a shut, it will measure 1 millivolt for 1 amp. There are several threads here that discuss that scheme. Do a search for stangsense.
Here is a photo of our rig that can control two motors. In this photo the motor is running and drawing 3 amps. By having this information you can know that your motor is running within the correct range and that the magic smoke will remain.
-Hugh