I don't think you can change it with an alternating 3 pole one. it's set up for a two pole on or off flasher. the same as the turn signals. but it would depend on how ford ran there wires if you could separate them. to do an alternating one, both lights left then right. you can tap into the harness on the bulb side of the brake, turn and the 4 way flasher switches. you would end up running wires from the four bulbs to the 1 and 2 terminals in the alternating flasher and then a separate switch to turn it on. one could find the wires by the fuse block or headlight switch so you did not have to run then from one end of the car to the other. but I would say you will need to make you own circuit. it's all in the way the power gets to the bulb.