Curt Trailer Wiring Harness Shows Constant Power

Question

Question:

Installed a Curt 56165 trailer harness and found it would not control the trailer lights. Checked the 4 pin plug with a voltmeter to show it is reading a constant 12 volts on all 3 pins without the lights on. I returned/replaced the kit and installed another with the same result. My understanding is that none of the control wiring should show any voltage with the car lights off? I need guidance on how to troubleshoot this issue or if it is a controller failure or faulty harness, return it again. Thank You

asked by: Mark

1

Helpful Expert Reply:

What you are describing seems to be common in some Curt trailer wiring harnesses that use a powered converter. If you were to pull the fuse out of the fuse holder it should not show power any more (with the vehicle on or off).

I would recommend going with the TowReady equivalent part # 118412. This harness is also compatible with your vehicle, and will install in the same manner. We have an installation video showing this harness being installed on a 2009 RAV4, click on the provided link.

expert reply by: Chris O

1

Answer 1

It sounds like something is causing a short circuit in the wiring of the Curt harness you mentioned in your question. I recommend checking all of the connections the harness is making to your vehicle to see if there is anything out of place that may…

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Answer 2

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 3

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 4

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 5

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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Answer 6

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 7

Thanks for the picture! I checked with Progressive Dynamics the replacement power converter you need for your Parallax Series 7300 Model 7345 is the Replacement Converter for Parallax/Magnetek or WFCO RV Power Centers - 45 Amp item #PD4645V.

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Answer 8

Hey Robert, yes the Kodiak disc brake calipers part #KDBC225DAC that you referenced will replace the Tie Down calipers you have now 46304, they can be used as a left or right hand caliper and does come with ceramic brake pads. If you ever needed…

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Answer 9

You will have to go with a sliding hitch to allow the trailer to make tight turns. For a trailer 8 feet wide the only bed length that's going to allow 90 degree turns without a slider is a stationary hitch. That being said you have two options.…

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Answer 10

To determine the size of the brake assemblies you need you have to measure the depth and width of the hub drum on the axle like what you see in the picture I attached. The most common size is 2-1/4 inch wide like the #T4071600-500 that you…

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Answer 11

I did some checking and the hub/drum we offer that will work for you is the part #8-430-5UC3. This uses the same bearings as the 8-415 and will be an exact fit aside from the fact this is a non-ABS setup and the 8-415 came in an ABS setup and non-ABS…

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Answer 12

Hello Andy! Yes, I would be happy to put together a flat tow package for your 2019 GMC Canyon. Here is what I recommend: - Roadmaster Direct-Connect Base Plate Kit - Removable Arms #RM-523182-5 - Roadmaster Nighthawk All-Terrain Tow Bar w/ LED Lights…

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Curt Trailer Wiring Harness Shows Constant Power

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