Neighbor was having a problem with one side going on and off. If off he could hit the lenses and it would come on. Now he has none. switch is good and fuses are fine. He has not checked trailer hook up. He has checked and replaced boards and bulbs. There is no power to the bulb in either side. Internet search came up with switch/junction on steering column. Any ideas?
2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L