Often it is used to allow 2 different high current draw appliances to operate but not at the same time.
In some units, it's a vacuum and a fireplace. Others could be 2- 1k btu ac's on a 30 amp circuit.
2011 351RLTS Eagle, Mor/Ryde suspension & pin box, Hughes PWD50 Power Watchdog
06 F350 Lariat PSD SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
2017 GMC Terrain (future TOAD)
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