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there is usualy a rubber grommet where cables and pipes run for the back window wipers. for me it was located on passenger side.
the wires will come down under passenger side of dash.
then run the cable throught the interior plastic trim.
IMO the best place to run ground is is to attach it to the same place the rear lights are grounded.
make sure any power cable is run on the opposite side of car to the AUX cables for sub