Volvo Trailer Hitch Wiring Harness - Genuine Volvo High Quality Genuine & OEM Volvo parts. Free Shipping and available now! See OE cross references for VOL-30756529. Includes FCP's Lifetime Warranty & Unlimited 365 Day Returns. Volvo Trailer Hitch Wiring Harness - Genuine Volvo 30756529 XC90 Part #: VOL-30756529 Genuine Volvo 3 reviews Available In Stock. Will this fit my car?5/5(3) Volvo Hitch Wiring | Harnesses, Adapters, Connectors Connect the wiring from any trailer to your Volvo, quickly and easily. We have the plug-and-play harnesses for the job with no need for cutting and splicing.