Possibly the fire extinguisher safety shut-off? It is is designed to prevent generator from running if the charge on automatic fire extinguisher is low.
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Clint C. Johnson / Fran Balm
Coach 289 '92 42'6" 8V92 Hybrid
Several Toads:
XL-7
F-350 4X4 Crewcab
F-250 4X4 Crewcab
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