Just did mine. Wish i would have written down the colors. Had to use a meter to find out which was which. Lights on key off gives tail. Lights off key on trans in reverse gives backups. Other is brakes. I got some 1.5 inch clear led's for reverse on ebay. For ground, drilled a hole in trunk tub side under carpet. Sanded paint inside and out, nut bold washers, paint over to prevent rust. Hope this helps.