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On fifth wheels, the converter/chargers are in the basement behind the partition - in with all the other spaghetti of plumbing and wiring. GD uses a 55 amp WFCO charger/converter in most units. It is not set up for lithium batteries (won't hurt them - just won't charge them all the way). The specific WFCO model number should be on the Serial Number Data Sheet that came with your RV or you can look it up on the GD parts lookup page (linked from the bar at the top of this page):
PS: If you'll use the search function on this forum, there are several posts on the topic including photos.
Rob & Laura
U.S. Army Retired (Rob)
2012 F350 DRW CC Lariat PS 6.7, PullRite OE 18K
2020 Solitude 310GK-R, MORryde IS and disc brakes, solar, BB LiFePO4, DP windows
(Previously in a 2016 Reflection 337RLS)
Full time since 08/2015
Most likely you have the WF-9855. To confirm, you will need to go behind the basement wall to find the converter and review the data label on it. I've attached the owners manual as well.
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