The cruise control in my Aerostar V6 4.0l has stopped working

I have done some diagnosis, and found the following:

Fuses, and power to the Cruise control amplifier (mounted by the glove box) are good.

Brake lights all are working.

I have removed the air bag, and ohm checked all of the switches, and they all pass the tests.

I have Ohm checked the Cruise Control Servo, and that appears to be good.

I did find that there is no power on the Servo+ lead side of
the Cruise control amplifier.

Does anyone have any tests that can be performed on the
amplifier itself to see if it is the culprit ?

Any help would be greatly appreciated.

I have been testing the cruise control system using
information from the following web site:

http://www.dalidesign.com/hbook/ccmain.html

Thanks !

 

 

Have you checked the BOO (brake on/off) switch? It dumps vacuum to the servo when you hit the brakes to turn off the cruise control. Also, make sure all of the vacuum lines are still attached and in good condition. Just a thought.