Rear light wiring change
Connect the yellow wire from left turn signal to left backup light, green wire from right turn signal to right backup light, leaving light green wires for your added on backup lights. Go under the dash, either cut or unplug the white wire from the stoplight switch. Run another wire from that side of the stoplight switch to the rear and connect to both tailight/stoplights , yellow and green wires. Be sure to insulate the loose end of the white wire under the dash as power may feed back through it from the turn signals. Install your amber bulbs in the backup lights and you should have it.
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