[Tfrazier]

So I finished installing the new air dryer today (kind of). The first test went smooth as can be. The system aired up as it normally would and purged around 130 psi. I was pretty excited. I shut everything down so I could clean up. Took a break for about an hour. Round 2: Started the coach. Both gauges read 50 psi. Within a minute of starting, the supply gauge started dropping and went down to 0. The brake side stayed at 50 psi.
I double checked my electrical connections, all good. No air leaks either.
Thoughts?