RPM,Bill's post got me to reread your question,I was assuming you have power at your control in the cab?Does the light come on for your control?
If there is no power at the control get a test light and check for power on the red wire in the white 6 pin plug for the control harness,(with the ignition on)If nothing check the red wire from the middle of the contorl harnes running to your fuse box or in that neighborhood,is there juice to that?The MM1's had an inline fuse in that wire,check that,The MM2's have a fuse under the hood no more than 6 inches from the Isolation module,check that.
IF you have power at the red wire in the WHITE control plug(from your cab control)Take a jumper wire from the red to the #4 pin(i think it's white,it's the pin opposite the red,jump these 2 pins and you should hear the solenoid "click",no "click"-bad selenoid.However if it clicks,-Problem in your control.
What contorl do you have?I posted all this info(may not be neccesary)becasue i saw my first Fishstick controll go bad yesterday after sitting all summer and was put away in working order,i haven't heard of to many failures like that.
Like i said,this info is useless if you have power at the control,if that's the case,replace the solenoid.