Trying to get Water plumbing right

[HVACguy]

Decided it was warm enough to attempt to get the water working for the first time, so I hooked up hose and regulator in driveway, and turned it on. I have water pouring out of one of two white hoses that appear to purposely terminate right above the frame behind the rear wheels drivers side, right below the bathroom area. I am guessing this is some type of drain, but the only drains I can find are one under the rear bed near pump, and one under bathroom sink. Both of these are little pull ring that pull or push ( i have them both pushed in) and they are on much smaller grey plastic lines. This is a 1989 Winn. Warrior. Any suggestions would be appreciated

[DaveVA78Chieftain]

Looking at the Warrior Brochures for 1989 and 1990 they seem fairly close.  The 1990 plumbing diagram may be of help

WCF22EC

WCF27EU