I am thinking about installing a battery under the rear seat by simply
running a heavy wire to the starter (which would in turn connect it to the
existing battery) and grounding to engine or chassis.  Would I need fusible
link/fuse on this wire?  What gauge wire?  I realize this will only give me
additional power when cranking or with ignition switch on.  This setup
seems too easy--am I missing something?
                                                        Jay