Update:

I'm standing at my workbench looking at this thing -- had been soaking with wd40 -- and about 12" away is a square 9v battery I had taken out of a smoke detector. I'm like, what the heck, let's see if it activates this valve.

Sure enough -- click, click, click. Click -- air goes through valve no problem. Seems loose and opening/closing properly.

Put it on the car...plug it in...nothing. Maybe it is working...but no pulsing/clicking anything.

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1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
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1989 Mustang GT Cobra Convertible
43k miles