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Subject:Re: was fav 12 V acc, now 2nd battery relay system
From:Mike Collum
Date:Wed, 21 Feb 2007 14:48:57 -0500
With the 1315 you can add a manual switch to use the aux battery to aid
the starting battery with starting the engine ... or you can wire to the
ignition switch so that paralleling the batteries when starting is
automatic.

Either way, you'll need to use 4 gauge wires for runs up to 10 feet or 2
gauge wires for runs 10 to 20 feet (not the little wire to the switch or
ignition switch).

Mike