Isuzu Wiring Harness NPR NQR GMC W3500 W4500 2006-2007 This is a used Isuzu Wiring Harness. Harness fits a 2006-2007 Isuzu 4HK1 Diesel Engine. Engine, cab and frame harnesses available. Your satisfaction is guaranteed. If you have an extra plug on top the bell housing of your transmission, it's bluish grey color, please refer to Stock# 2711. Please specify which harness you need; dash/cab, engine or chassis. GMC W3500 Forward Fuel Pump Wiring Harness | Auto Parts We've got a wide rang of top-quality GMC W3500 Forward Fuel Pump Wiring Harness of all the best brands in the industry at an affordable rate. All of our Fuel Pump Wiring Harnesss are guaranteed to fit if you use enter your GMC W3500 Forward into your Year Make Model selector. We provide incredibly reasonable prices on quality parts.