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Motorhome Towing A Car With A Tow Bar Wiring Diagram

2 Wire Tow 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 Tow Vehicle Taillight System

Note: needs to be converted to 2 way with a taillight converter.

  • 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)

Basic 2 Wire Type Trailer Wiring

Optional License Plate Wiring

Optional License Plate Trailer Wiring

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.

Trailer Wiring Diagrams

Trailer Wiring Diagrams

Taillight Converters

Vehicle Specific Trailer Harness

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

4 and 7 way trailer connector

Multi-Tow Connectors

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