Motorhome Towing A Car With A Tow Bar Wiring Diagram

2 Wire Vehicle Taillight System

• Tow vehicle or towed vehicle has same bulb for lighting stop and turn signals.
• Some vehicles have a separate bulb for stoplights but also may have a combination bulb for turn and stop.

3 Wire Vehicle Taillight System

• Tow vehicle or towed vehicle has amber turn signals, separate.
• Has separate bulbs for lighting stop and turn signals (both red).

Basic 2 Wire Tow Vehicle (truck / motorhome) To 2 Wire Towed Vehicle (car)

4 pole round to 4 pole round extension cable, 8 feet

Diodes

4 pole female socket

Trailer cable and wire

Automotive primary wire

2 Wire Tow Vehicle (truck / motorhome) To 3 Wire Towed Vehicle (car)

Optional License Plate Wiring

6 pole round to 6 pole round extension cable, 8 foot

Diodes

6 pole female socket

2 to 3 way converter

Trailer cable and wire

Installation Notes: Install diodes as close as possible to the taillights. Use a minimum of 14 gauge wire running from the front of the towed vehicle to the rear diode connections. Use a dielectric grease to protect the electrical connections from corrosion. Cover wire / connectors with some form of conduit to protect from electrical shorts. Use ties or clamps to secure harness to the vehicle. Do not attach wiring harness close to moving parts or engine exhaust. Vehicle Exceptions: The taillight harness on the Ford Freestar, 2005 to 2007 and Mercury Monterey 2005 to 2007 can not be cut. Also, problems may arise with vehicles equipped with lamp out modules. Diodes only allow current to flow one way.

Also Available

Trailer Wiring Diagrams

Taillight Converters

Vehicle Specific Trailer Wiring Harness by make, model and year.

Multi-Tow Connectors

Car Care / Maintenance	Cargo Management	12 Volt Auto Electrical	Exterior Accessories
Gas & Diesel Performance	Interior Accessories	Lighting	Mirrors
Safety & Security	Air Suspension & Chassis	Towing Accessories	Truck Bed Tonneau Covers

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