Inverter and other items (CO2/smoke detector) are directly tied to the batteries - the cutoff switches don't disconnect them. The inverter has a power draw even when turned off. So to have a spark occur when disconnecting / connecting cables is not unexpected.
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Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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