Does the Ground Wire On the 7-Way Need to Run to the Battery

Question

Question:

If you run a 10 ga wire to the positive post do you also need to run a wire from the negative pin to the negative post on the battery

asked by: David

1

Helpful Expert Reply:

In regards to wiring a seven way trailer connector, the twelve volt power wire or otherwise known as the battery charge line circuit will need to be run from the trailer connector to the positive terminal of the battery. The ground wire circuit from the trailer connector does not need to be run to the negative battery terminal, it can just be ground to the frame or body. I recommend the 7-Way Install Kit part # ETBC7 which comes with everything you need. The duplex wire has two ten gauge wires, one will run to the battery and the other to the brake controller in the vehicle acting as the brake output wire, not the ground.

expert reply by: Conner L

1

Answer 1

You would not be able to charge your battery through the wiring on your 4-way trailer connector. Since your truck has a 7-way connector, you could maintain the power to the battery but not charge it. To begin, you would need to cut off your 4-way…

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Answer 2

The dealer tech you talked to is somewhat correct. The issue is that the red brake output wire can back feed into the wiring of your 2020 Toyota Highlander, but there is a fix that will fix this. Your Highlander will need to have a Tekonsha,…

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Answer 3

The correct 4-way trailer wiring harness for your 2022 Toyota Highlander is going to depend on if you have the factory tow package or not; based on that you will need one of the following: - WITHOUT Factory Tow Package: T-One Vehicle Wiring Harness…

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Answer 4

If you take a look at the accompanying photo you can see our installer point out the exact location where you need to install the fuse in your 2018 Toyota Highlander when installing the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer…

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Answer 5

Most if not all trailer wiring harnesses/connectors use larger wires for the 12 volt and ground circuits compared to the other circuits (lights). The sockets themselves don't have an amperage rating so you will go by the draw of the things…

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Answer 6

For your 2022 Toyota Highlander the correct and best option for a 4-way harness is the part #TK99FR for if you do not have the tow package or the #TK74FR for if you do have the tow package. If you are not sure whether or not you have the factory tow…

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Answer 7

There is not a replacement 7-way harness, but you can add one to your 2022 Toyota Highlander, and to do so all you'll need is the following: - Universal Installation Kit for Trailer Brake Controller #ETBC7 You'll plug your 4-way into the…

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Answer 8

For some reason Toyota isn't very forthcoming with how to figure out if you have the tow package or not. From my understanding all of the V6 models of the 2019 Toyota Highlander have the tow package but it isn't specified as to what else…

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Answer 9

Because of their superior reliability, I'd recommend the #TK99FR T-One Wiring Harness from Tekonsha. As you can see by clicking the provided video and installation instruction links, the install is pretty straightforward. This is a two piece…

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Answer 10

For your 2022 Toyota Highlander, along with the Redarc Tow Pro Elite #RED44FR, you're also going to need a 4-flat trailer connector #TK99FR, and a 7-way trailer connector #ETBC7. If you have the factory towing package, you can use the T-One…

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Answer 11

While the #119250KIT does need to attach directly to the positive post of a vehicle battery it does not draw any amperage unless there's a trailer connected to it so you do not need to worry about this draining the vehicle batteries when not…

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Answer 12

The battery on the trailer will not charge if it is attached to the 12V power wire from the towing vehicle. It will provide a small amount of current that helps maintain the current charge of the trailer battery. I recommend using a battery charger…

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Does the Ground Wire On the 7-Way Need to Run to the Battery

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