just give him benedryl. or claritin. allergy meds. under age 12 givw him one. over age 12. give him two
If all of them are out you probably blew a fuse. There are multiple fuse boxes located in the vehicle. Check your manual to see whuch one has the taillight fuses. When you find it go through the row of fuses and try to locate a blown. Also demate and remate any associated relays. This will givw you a fresh contact surface electrical bond incase one might be corroded.