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Turn off all the valves then open the first one and see which location it services, then do the next valve etc. Should be pretty simple to determine all of them in a matter of minutes. Then just make labels.
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
I have a '06 Monterey. If your '04 is like my '06, the Manabloc valve set is ordered from top down; Fill Tank, Kitchen Sink, Bath Sink, Shower, Cloths Washer, Outside Faucet, Low Point Drain. Hope this helps.