The 40 Pin CAT Harness - Peterbilt 389 from TQI is a genuine TQI heavy-duty truck part you can count on. Built to keep your diesel running strong through the daily grind of over-the-road and vocational work.
Cab Harness - Engine to Firewall 40 Pin CAT to Peterbilt 389 Glider
Fitment: Confirm this part fits your truck's make, model, and year before ordering — our parts team is glad to help.
Why Fitzgerald Truck Parts: fast shipping on in-stock parts, our fitment guarantee, and real heavy-duty parts experts on the phone. Questions? Call 888-873-0448.
