Difference Between the Tow Ready Harness and the Curt Harness for a 2009 Toyota Corolla

Question:

Why does #118459 have to be run to the battery, when#55542 only need to be wired at the tail lights ? Also #55542 is about $ 10.00 cheaper and looks even easier to wire.

asked by: Ralph

Expert Reply:

The reason a wire is run to the battery on the Tow Ready Harness # 118459 is to help protect the tail light circuitry of your 2009 Toyota Corolla. You see, the # 118459 uses the tail light circuitry of the vehicle merely as signal wires and powers the tail lights of your trailer with the power it gets from the battery. Tail light circuits can be damaged if they are overdrawn and the # 118459 eliminates this problem by bypassing the tail light circuits as power sources.

The Curt T-Connector Vehicle Wiring Harness # 55542 that you referenced will draw the power to illuminate your trailer tail lights from the tail light circuits of your vehicle. Whenever available, we recommend people go with wiring harnesses like the # 118459 to prevent any future wiring headaches.

expert reply by: Jameson C