Converting 4-Pole Trailer Connector on 2010 Prius to 7-Way

Updated 05/25/2015 | Published 05/21/2015

Products Featured in This Question

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

(230)

$59.08

Adapter 4-Pole to 7-Pole and 4-Pole

(658)

$58.71

7-Way Round RV Style Trailer Connector - Trailer Side

(364)

$13.57

Question:

I have purchased a Curtis 56147 4-way wiring loom to compliment the trailer hitch, I purchased from eTrailer. The trailer connection is a 4 pin plug. My trailer has a 7 pin flat plug. Will the tail-light/brake light on the trailer work from the single tail outlet on the Curt module or will I have to add a 7 pin converter connection to the loom to power the tail a nd brake light? The hitch works a treat on the 2010 Prius. Thank you.

asked by: Royd C

Expert Reply:

When you state that your trailer has a 7-pin flat pin plug, are you referring to a 7-way like part # A7WCB?

If so, please be aware that a 7-way connector such as that would frequently be found on a larger trailer that has electric brakes that probably shouldn't be towed by a Prius. I don't believe Toyota recommends using the Prius for towing, you'll want to consult your owner's manual.

If the trailer is smaller and doesn't have brakes, you can use an adapter like # 37185 to convert the 4-pole on the Prius to a 7-way blade-style connector. Since it sounds like your trailer has a combined brake lamp system, this arrangement should work just fine. The converter provided by the Curt # C56147 takes the separated turn signal and brake lamp circuits and combines them into a right turn/brake and left turn/brake for the trailer.

expert reply by: Mike L