Most coaches today are equipped with a tow plug at the rear to connect the motor home lights to lights on the towed vehicle.  Wiring the tow plug takes time and patience.  Perform the task when you are not in a hurry, and there are no distractions.  Tools needed are a 12-Volt test light, digital voltmeter, black tape, small straight blade screwdriver, and a small Phillips screwdriver.

Configuration of the plug on the coach will determine what type of plug is required for the tow car.  Connecters can have four, six, and even up to seven pins.  Make note if the connection is round or flat, and whether it has four, six or seven prongs.

How the tow plug is wired is dependent on the rear taillight style.  If the coach taillights are yellow lens, a converter taillight adapter is required.  If the coach taillights are red lens, a converter is not required, unless the tow car has amber turn signals.  Red taillights, red brake lights, and separate amber turn signals indicate a 3-wire system.  Vehicles that share the brake light and red turn signals are a 2-wire system.  A converter box is needed when connecting dissimilar systems.

A good ground is important when wiring tow plugs.  If you use a self-taper and drill through the frame, be sure to clean the paint off prior to securing the ground wire.  It is also recommended to drill a quarter-inch hole and insert a quarter-inch bolt using a lock nut for the ground lug.  This will ensure tightness and provide the best service for a longer period of time.

Wire is important.  Wiring for the tow car should include a nice protective jacket.  Do not pull four wires and simply tape them.  Position a loom over the wires or upgrade to a full cover, and it will last much longer.

Magnetic lights are easy to use by simply placing them on the rear bumper of the tow car.  However, remember to remove the lights when driving through a car wash.

Equip your motor home toolbox with wire ties, black tape, side cutters, a test light, and a continuity tester.

To test the lights, have someone sit in the driver’s seat and engage turn signals, park lights, one at a time, and then step on the brake, while you are standing at the rear of the tow vehicle observing the lights.

Draw a diagram of the plug to designate each location.  When lights fail to operate on the tow vehicle, test the plug to insure power is present.

Never drive the motor home with an attached tow vehicle if the tow plug is inoperable.  Stay safe and get the tow plug repaired before you start out.