Yea is should if not test says bad pbu or wire in between. I believe I have 
confirmed wire is good by grounding the 7 pin in the car, compressor kicks on. 
I find it hard to believe all 10 or so pbu I have on hand are bad

Sent from my iPhone

On Jul 27, 2013, at 3:49 PM, Peter Frederick <psf...@earthlink.net> wrote:

> Shouldn't the pressure switch have 12V?
> 
> Peter
> 
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