Troubleshooting 2020 Subaru Outback Trailer Wiring with Bad Running Light Circuit

Question

Question:

The brake lights and turn signals work really well. However, the regular running/tail lights do not work. They haven’t worked on multiple trailers, including standalone magnetic lights. On my tester, the tail light indicator lights up, but it doesn’t drive the actual lights. Any tips?

asked by: Tristan D

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Expert Reply:

It's possible that you've got a bad connection on the tail light/running light circuit, but I recommend that you begin by using a multimeter like the # PT89ZR to see what the output voltage on the circuit is at the plug. It sounds like you might be getting microvolts on the wires but not a full 12v, but the amount of voltage might give some clues as to what's going on here. If you've installed an aftermarket wiring harness like the Curt # C56040, then I also recommend checking the ground connection and making sure it is firmly secured to a paint, rust or debris free spot on the frame.

If you can check the voltage and also the owners manual on your Outback to see if there are towing related fuses in your fuse box that can be checked, and let me know what you find, I'm happy to continue assisting you on this.

expert reply by: Erik B

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Answer 1

We have exactly what you need to install a 7-Way connector on your new 2019 Subaru Outback Wagon so you can connect with the 7-Way on your trailer. You will need to start with a 4-Way harness and for this the Tekonsha T-One #118467 will work…

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Answer 2

The most common issue we see with the Tekonsha Prodigy P3 Trailer Brake Controller part #90195 causing the brakes to grab at slow speed is due to an error in the initial setup. Therefore, I recommend you repeat the initial setup for the Tekonsha…

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Answer 3

It sounds like you're looking for an adapter like the Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat #C57672. The Curt adapter should be mounted to your vehicle. This will have both the 4-way and 7-way connection. Since it…

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Answer 4

Hello Eduard. So, the miady adapter that you mentioned is not going to work with the Prodigy RF brake controller. Reason being, that adapter has brake light and turn signal functions only. In order to use the Prodigy RF, the 7-way plug also needs to…

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Answer 5

The #C57672 will allow you to convert an existing 4 pin connector on a vehicle and allow it tow a trailer that has a 7-way. By attaching the mounting bracket to the underside of the bumper or chassis of the tow vehicle, plugging the 4 pin on the…

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Answer 6

The best trailer wiring kit we offer for your 2020 Subaru Outback Wagon is the Curt trailer wiring harness part #C56040 as it installs very easily and has the highest amperage rated converter box which allows it to be the most resistant to internal…

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Answer 7

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 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

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

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Answer 10

Lance does have a proprietary plug, but many customers see a standard 6-way or 7-way round and notice it doesn't fit their factory 7-way as well. I've attached an article to help if you have one of the 7-way or 6-way round connectors which we…

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Answer 11

Yep, so long as your 2024 Subaru Crosstrek Wilderness is not a hybrid both the Curt and etrailer hitches will fit: - Curt Trailer Hitch Receiver #C13382 - etrailer Trailer Hitch Receiver #e98912 The only difference besides price is the finish; the…

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Answer 12

I definitely understand being a bit overwhelmed by the amount of options in front of you, however I can definitely help with differentiating the trailer hitches for your 2019 Subaru Outback Wagon along with explaining my personal recommendation,…

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