[wagonman76]

Since youre not getting 12v to the solenoid, but youre getting something, a cheap fix might be to wire a relay to it. Of course, it might be a temporary fix since whatever is failing is bound to fail the rest of the way eventually.

Another thing to check would be the quality of the wiring to the solenoids unit. Maybe check the resistance of the actual wires? What Ive experienced several times is wires nearly broken inside their insulation. If you test it with a multimeter, it actually shows a good voltage. But put load on it, and it wont pass the current and wont function the device. Ive had this 3 times with my fuel pump relay wiring, and once with the headlights on someone elses Cherokee.