[2BirdDogs]

You cannot back feed through the multiplier. It’s a one way deal.

Look in the lower left corner of that engine bay for a 2nd air chuck. That one feeds into the coach air system.

Thanks Richard. I checked and don’t see a second chuck in the left corner of my engine bay. I have my shop air connected to the “AFT for pneumatic tools” chuck that is next to the “forward high pressure” chuck. It seems to air up the airbags and brake tanks but not the Bode if I turn off the 120v compressor. It could be an anomaly caused by the crazy low temps we have been having here in middle TN (along with the rest of the country). Attached is a quick picture of my shop air connection. Thanks as always for sharing your insight. 

Paul