My 2019 had wires (pos and neg) from the connector on the roof to the charge controller location (which were horribly installed and unsafe) and then two more (pos and neg) from the charge controller location to the battery bay. Then there is is a separate set of wires (pos and neg) from the quick connect port inside the wet bay to the battery bay.
Camping Progression: Tent, 2003 Clipper Classic 1255 ST - Gone, 2014 Dutchman Aerolite 282DBHS - Gone
2019 Jayco North Point 377 RLBH
Tow Rig: 2015 Ford F-450 Platinum, airbags, B&W Companion hitch for factory puck system.