im gonna guess its a battery combine-switch....probably allows you to combine the engine batteries with the house batteries (in cases were house batteries are dead) so you can start the generator.
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Don R.
'04 Haulmark (M42386) 42', 2 slide, 10kw - Pictures
'04 F350 CrewCab Longbed 4x4, 50g aux tank & gear vendors dbl over
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