What lights will you need to check on the exterior?

You need to check the hazard, left turn, right turn, headlights high and low beam, and the clearance lights. Remember to check each at the front of the vehicle except brake lights, all but headlights and brake lights on both sides, and all except headlights at the back of the vehicle. If this is a combination vehicle, check the rear of the tractor for all except headlights.