Mine has three switches on the rear of the battery compartment. The top is House, middle is emergency jump and the bottom is the chassis. The middle switch should always be left off and never used to jump with a starting load. Its only/main use is to start up the Vansco, it the chassis batteries are dead, so that the dash battery jump switch can be used.
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Dale Gerstel
AMG GTS
Las Vegas, NV
Had: 2007 Limited SE 40fdts
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