How To Install a 7-Way Trailer Wiring Harness On a 2019 Subaru Ascent

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Question:

Installed the following on the Ascent and using a Tekonsha P2 controller: 76253 Draw-Tite Max-Frame Trailer Hitch Receiver - Custom Fit - Class III - 2 C56040 Curt T-Connector Vehicle Wiring Harness 4-Pole Flat Trailer Connector ETBC7 Universal Installation Kit for Trailer Brake Controller - 7-Way 3062-P Tekonsha brake controller wiring harness Ive ran the 10 ga wire to the front of the vehicle. Just want to confirm the connections I reviewed the instructions for the ETBC7, but it appears to be for direct wiring the brake controller. - Black wire - connects to battery using the 40-amp breaker. Does this need to be covered somehow since its a hot wire? - White wire - Use the 20- or 30-amp breaker for Tekonsha controller? Since using the 3062-P, I assume this goes through the firewall and connects to the Blue wire on the brake controller harness and all other wires are connected through the plug?.

asked by: Mike

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Expert Reply:

There are two different 7-way trailer wiring harnesses for a 2019 Subaru Ascent dependent on whether or not you have the factory tow package. If you do have the factory tow package then you should be using the Tekonsha OEM Replacement Vehicle Wiring Harness part # 118290, not the Universal Installation Kit for Trailer Brake Controller part # ETBC7. If you found a plug under the dash for the Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers part # 3062-P then you have the factory tow package.

Therefore, if you have the factory tow package you don't need to run a wire from the trailer connector to the brake controller but you will need to run one from the trailer connector to the battery. If you don't have factory tow package then you will need to run both the black wire from the trailer connector to the vehicle's battery and the blue then white brake output wire up to the back of the brake controller. The black battery charge line circuit that runs from the trailer connector to the vehicle's battery does not need to covered but it would be a good idea to do so with some wire loom, part # 7509-10 will do the job though you may need two.

expert reply by: Conner L

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Answer 1

Yes, we do have a wiring harness that has both a 7-way and a 4-way for your 2020 Subaru Ascent. However, you will need a 4-way connector on your car before this will work though. I recommend the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat…

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Answer 2

You will want to use the short no drill mounting bracket #18140 to secure the 7-way connector to the Curt #C25VR on your 2021 Subaru Ascent. If you have not already ordered the 7-way connector I recommend the Tekonsha OEM Replacement Vehicle Wiring…

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Answer 3

The best hitch receiver for hauling a bike with your 2022 Subaru Ascent is going to be the Curt Trailer Hitch Receiver - Custom Fit - Class III - 2" item #C25VR. This hitch receiver mounts behind your rear bumper bar instead of below your…

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Answer 4

Yes, there is a plug in 7-way connector for your 2019 Subaru Ascent. It is the Tekonsha OEM Replacement Vehicle Wiring Harness with 7-Way Trailer Connector item #118290. It uses the same connector as the 4-ways. I have linked the installation…

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Answer 5

Basically all of the instructions for trailer wiring like the Tekonsha #118290 for your 2020 Subaru Ascent are kind of vague when it comes to routing the power wire to the battery which is why we came up with a helpful article on this (see attached).…

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Answer 6

Tow Ready 4-Pole to 5-Pole Trailer Wiring Adapter #20036 is exactly what you need to allow your Honda Pilot with 4-pole trailer wiring to operate the reverse lockout feature on your trailer coupler. All you need to do is find a taillight wire that…

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Answer 7

The correct wiring harness needed will depend on the type of trailer you're wanting to pull. If you're pulling something basic like a small utility trailer and only need a 4 pole trailer connector, the #118790 would be what you need. However,…

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Answer 8

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 9

The Curt Echo Trailer Brake Controller #C51180 won't itself provide any charge to your trailer mounted battery, but you certainly can still have a 12V power wire ran from the 7-Way to the battery for this purpose with the Echo in place. The Echo…

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Answer 10

If all of your signals are working there may be no need to connect the wire that is for the 12 Volt trailer power on the Tekonsha OEM Replacement Vehicle Wiring Harness with 7-Way Trailer Connector part #118290 but I can not advise you to do anything…

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Answer 11

I'd give the Tekonsha item #90195 the edge for ease of use. The full LCD display provides the status of your braking system at a glance, while the item #RED44FR Redarc Tow Pro Elite uses colored LED's to indicate problems. The display of the…

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Answer 12

Due to the thinner gauge wiring of the #118290 for the 12 volt accessory circuit you'd be limited to the 20 amp charger for your battery.

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How To Install a 7-Way Trailer Wiring Harness On a 2019 Subaru Ascent

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