You can but it's not simply splicing a few wires together. The easiest for the front is to do away with the park lights since no state requires them by law. Cut the wire connecting the left to the right park lights. The other option is to put dual contact sockets and bulbs in them. The left front t/s will be connected to the light blue wire at the column and the right to the dark blue. The wire that used to go to the brake lights in the back will now be cut and run to the white wire at the column. You can splice the old brake light wire to the left (yellow) wire at the column but then cut the wire that ran from the left to the right side across the back of the bed. Run a new wire to the right rear brake light that hooks to the green wire at the column. Both the turn signals and brake lights work through these wires. Your 12v feed hooks to the purple wire and dont worry about leftover wires which will include the emergency flasher and the horn. The brown wire that runs to the rear is your tail lights and license light and can be left alone.

Evan