I don't have your model, but look very close behind or below your power distribution panels (breaker boxes). My breaker boxes are in a panel just to the right of the entrance door, and the converter is directly below, with access inside the basement storage area behind a false plywood wall. Usually your converter is within a couple of feet of the breakers. If still unable to find it, email Jayco, and they will send you a schematic of your electric system, complete with locations of components.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.