There is no significant power at the three wire plug at the control ****, the three wires are directly wired to a potentiometer. In the five wire plug on the actuator there is a ground and twelve volts. To test ****, use a multimeter to check for changes in resistance from the middle to the outsides, and for a constant resistance on the outsides. Use a voltmeter to check for 12 volts at the actuator plug, hooking to the two wires that are diff colors than the three that go to the control ****. If you have 0 volts with key in run position, you prolly have blown fuse. The **** resistance can be checked regardless of key position. If turning the **** varies the resistance, and you have twelve volts in run, then your actuator is probably bad. iF turning the **** yields no change in resistance, than the **** is slipping and not turning the shaft it sits on.