16ACE27 is correct as confirmed by Thor customer support.
On a Mercedes chassis a Battery Isolation Manager (BIM) made by Precision Circuits Inc can be implemented. The BIM isolates the two battery systems, chassis and coach, in a motorhome. This prevents loads in one system from discharging both. It also connects the two battery systems together during charging. Both batteries are charged if either is being charged. The coach battery is charged while driving and the chassis battery is charged while plugged into shore power at a campground.
www.PrecisionCircuitsinc.com
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