Chevrolet HHR Wiring Harness - jcwhitney wwwitney›Chevrolet›HHRGet the JC Whitney E-Catalog. Bummer! We no longer print our legendary catalog. But hey! You can still view our most popular products in our electronic version of the Chevy HHR Hitch Wiring | Harnesses, Adapters, Connectors wwwd››Trailer Hitches›Hitch Wiring›ChevyWhen you tow with your Chevy HHR, you’ll have no problem making the electrical connection to any trailer with our selection of harnesses, adapters and connectors.