Adding a 7-Way and Brake Controller to a 2007 Volvo XC90 with 4-Way Connector

Question

Question:

I purchased and installed this part last year - worked like a charm for my needs at the time U-Haul trailer but now I am looking at towing a small fiberglass camping trailer not yet purchased, e.g. Casita, Scamp, etc. 1. Is there an item that is a quick n dirty adapter from 4-pin to 7-pin that would allow me to plug and tow something home, understanding that there would only be tail/brake lights and no brake controller or aux power? 2. What do I need to replace this item with the appropriate 7-pin, including a brake controller? Thanks for your help!

asked by: Jenni C

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Expert Reply:

I will be happy to help. There are a couple of ways you can add a 7-Way trailer connector to your 2007 Volvo XC90. If you just want the lights to function on the trailer then you can use # 37185. Your 4-Way will plug into this adapter and then you just have to mount it and ground the white wire to a bare metal surface. The other wires can be taped up and stowed out of the way.

If you want to have a fully functional 7-Way and a brake controller then instead of 37185 you will need # ETBC7. It will provide the 7-Way and the wiring and accessories needed to install a brake controller. I have included some links that show and explain the ETBC7 installation for you.

For a brake controller I almost always recommend the P2 # 90885 because customers find it easy to set up and use and it is a reliable controller.

expert reply by: Michael H

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Answer 1

So there are a couple of possible issues here, though just to answer your question about larger brakes, you do need to stick with 10 inch brakes as 12 inch brakes will be too large. Based on my research, your Forest River Flagstaff E-Pro E20BHS. The…

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Answer 2

You won't need to cut the bumper fascia to install a 7-way. We used a #18136 no-drill bracket that attaches to the hitch crossbar using a pipe clamp. Since the Curt #C53HR hitch crossbar is concealed behind the bumper, the #18136 bracket can be…

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Answer 3

That's right, the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part #118411 and the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part #C56045 are very similar for the 2005 Volvo XC90. They…

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Answer 4

Hey Ryan, The Draw-Tite Trailer Hitch Receiver #75152 is on extended backorder with no expected in-stock date so it's harder to find on the site to prevent people from purchasing it and then being disappointed that they have to wait forever. The…

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Answer 5

Your Volvo XC90 will require the T-One Vehicle Wiring Harness with 4 Pole Trailer Connector, item #118411. This wiring harness will protect your vehicle's sensitive wiring and computers from electrical shorts and mis-wired trailers. There is no…

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Answer 6

Fascia trimming is required for both the #e45KR and the #13559 hitches that are available for your 2005 Volvo XC90. To see what the hitch looks like when installed, we have some photos that you can see by clicking on the links on the product…

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Answer 7

When it comes to the installation, both the Curt #13559 and etrailer #e45KR hitches for your 2008 Volvo XC90 are the exact same. I recommend going with the etrailer because it has a matte black finish that helps it blend in with black trim on your…

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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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