Somehow on all my cars I find a grommet that lets me get thru the
firewall without drilling.


One choice I've resorted to on a number of installations in sedans is
to locate where the major cable bundle on the driver's side firewall goes
through. It is usually embedded in a very large rubber seal. I usually
can take a sharp flat bladed screwdriver and poke a hold in this rubber,
being careful not to hit the cables in the center bundle. Poking a #14
black and red wires through this new slot is not difficult and usually
provides adequate power from the battery to most dash mounted radios and
other equipment.


Ed