Connecting a Trailer w/ 7-Way to Vehicle w/ 4-Way Connector

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Question:

I would like to use this as a just in caseinch tool with my trailer. The trailer has brakes and a 7-way, but if I find myself needing to move it with a vehicle that only has a 4-way, Id like to use this for short periods of time to power the lights. Lights only is better than nothing if you dont have a brake controller, right? If that is all it is for, can I splice the loose white wire into the white wire that is part of the 4-flat? Wouldnt that attach the lights to ground? Is this not how it is by default so that you dont overload wire that is only supposed to handle light current?

asked by: Daniel

0

Expert Reply:

You could wire the Tow Ready Adapter 4 Pole to 7 Pole # 30717 and just have the light functions on your tow vehicle without connecting the other wires. But I would be very cautious about not doing so for several reasons.

The first reason is safety. The general rule for towing trailers with brakes, is that if the Gross Trailer Weight is half of the Gross Vehicle Weight, it is recommended to use a brake controller and have brakes on the trailer.

Not being able to activate the trailer brakes can be dangerous. The weight of the trailer will act as a force to keep pushing your tow vehicle forward as you are trying to stop. As you may know, the more mass a traveling object has, the more force it takes to bring that object to a stop. So, with your vehicle connected to a trailer, you are adding more overall weight but not increasing the braking power.

The white wire of part # 30717 would need to be connected to a clean metal surface, like the vehicle frame.

I can understand that the cost of adding a 7-way and a brake controller to your vehicle may out weigh the benefit of only being able to use it minimally. If you find yourself towing with different vehicles, you may want to consider the Prodigy RF Brake Controller # TK94FR. The RF Controller mounts to the trailer and allows you tow with various vehicles as long as there is a 7-way on the vehicle and a dedicated power from the black wire on the 30717 adapter to vehicle battery via a 40 amp circuit breaker # PK54540. For wiring, you will want to use 10 Gauge Wire, part # 10-1-1, which you will need to measure to determine how much wire you will need. It is best to order more than needed to make sure you have enough.

I have linked instructions for the Tekonsha Prodigy RF Brake Controller # TK94FR.

expert reply by: Reno H

0

Answer 1

If you are wiring up a 7-way and your plan is to use a wireless brake controller like the Curt Echo Mobile part #C51180 the blue wire does not need to be ran but the black wire needs to be ran to the positive post of your battery using 10 gauge wire…

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Answer 2

Since your 2019 RAV4 already has a 4-way wiring harness, you will need the Universal Installation Kit item #ETBC7. The kit includes a pre-wired 7- and 4-way trailer connector that mounts easily at the rear of your vehicle with an included bracket.…

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Answer 3

The trailer brake output or blue wire is not connected on a 4 to 7-way adapter like the 4 to 7-Way with 4-Way Adapter part #ETBC7L when using a wireless trailer brake controller like the Curt Echo Wireless Brake Controller part #C51180. The two four…

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Answer 4

Since you have an existing 4-flat like part #118516 on the 2007 Mitsubishi Endeavor, you will need part #ETBC7L to give you a 7-way plug on the back of your vehicle so you can go boating with your new boat and trailer. To install the 7-way plug you…

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Answer 5

The easiest way to install a brake controller on your 2022 Toyota Highlander with a 4-way is to first install a 7-way kit with the part #TK57VR which includes brake controller wiring as well. Then for a brake controller the Curt Echo Mobile part…

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Answer 6

For the Curt #C51180 Echo wireless brake controller, the circuit ran to the battery doesn't only power the controller and deliver power to the trailer brakes, but it also passes 12-v accessory power through to the trailer. We typically recommend…

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Answer 7

You can use that wire, but you will want to install the 40 amp breaker that came with your #ETBC7L. The Echo #C51180 won't pull that much power but the combination of the brake controller and the trailer would cause your 20 amp fuse to blow.

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Answer 8

A simple way to bypass the confusing wiring of your 2013 Porsche Cayenne would be to run a length of 10 gauge wire from the positive battery post of your vehicle through a 40 amp breaker like part #PK54540 and then back to the 12 volt accessory…

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Answer 9

Actually, for the Echo brake controller, you'll really only need the #ETBC7L kit, but the #ETBC7 kit you have will certainly work. You just won't need all the included parts. To install the Curt #C51180 Echo wireless brake controller,…

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Answer 10

Since your 2022 Toyota Sienna has a factory 4-way the easiest brake controller and 7-way install solution would be to use the #ETBC7L to convert it to a 7-way and then for a brake controller the Curt Echo Mobile part #C51180 and you'd be set.

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Answer 11

To install the Curt Echo Trailer Brake Controller #C51180 on your 2014 BMW X5 that is already equipped with a 4-Way, you will just need the Hopkins 4-Pole to 7-Pole Adapter #37185, some 10 Gauge Wire #10-1-1 (sold by the foot), and a 40 amp Circuit…

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Answer 12

To install the P2, part #90885 brake controller in your Touareg you will need to do some hardwiring. If you do not have a 4-way connector at the rear of your Touareg you will need to install a trailer wiring connector like part #118668. You will then…

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Connecting a Trailer w/ 7-Way to Vehicle w/ 4-Way Connector

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