dual batt, primary 2ndry, how do i tell?

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Originally Posted by manchild21000

Hi Dave
The aux battery will be a deep cycle while the main is a cranking one . Look for amp hour and cca ratings on them . Accesories should run off the aux battery .
Cheers

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Aux can be any battery that will fit the space.

As others said, the starting battery should normally be on the driver's side on a D1. Are the batteries connected by an isolator? Does a cable, probably red, connect the positive terminals on both batteries to a little box or other style of isolator in between the two batteries?