Lance roof solar plug question

We have owned 2 Lance campers and have wired both for solar. The first was an 845 which had 2 wires for hooking up the solar, one blue, one white. The second is a 2009 830 (purchased 2 years ago)which only had one blue wire for the hot. I spent a LOT of time checking but my best guess is that the ground was prewired, and it seems to work just fine. I hooked up 100 watts of solar, one 75 watt panel and one 25 watt panel with independent controllers and added a battery switch. I tied the 25 watt panel into the prewire and ran independent wires for the 75 watt. Without getting into it I have my reasons for doing it this way however I would suggest that running 100 watts through the Lance prewire setup (14 gauge)would lead to a reduction in recharging capability. I added a second input on the roof just aft of the TV antenna that went down through the pantry locker and used 8 gauge wire for the 75 watt panel. With 100 watts we can easily go a week without power. However........if you desire an inverter for coffee, etc you may be challenged. If you want more info pm me