Saab 9-3 Trailer Wiring | etrailer Guaranteed fit Saab 9-3 Trailer Wiring. Lowest price guaranteed. Thousands of customer trailer wiring reviews, expert tips and recommendation. Lowest price guaranteed, easy online ordering at etrailer or call 800-298-8924. Saab 9-3 Hitch Wiring | Harnesses, Adapters, Connectors When you tow with your Saab 9-3, you’ll have no problem making the electrical connection to any trailer with our selection of harnesses, adapters and connectors.