8437-1 Western Fisher HB-3, HB-4 4 Port 3 Plug Wiring Kit Isolation Module Truck Side Light Harness

The 4 port module system has been discontinued. You would need to upgrade to the 3 port module instead. If you have everything except the light wiring, you would need 29047, 29070-1, and 29048. 

If you need the complete wiring kit for the truck side, those can be found here - 
Straight Blade.
V Plow.

Click here to use the Western Power Match to get the correct light harness.

This is the Truck Side Light Wiring Kit for GMC and Chevy trucks '99 and later with HB-3 and HB-4 headlights. The part # on this kit is 8437-1. You get the 4-port module 27781 (green label), 26357 truck side 11-pin light harness, 26361-1 short harness, and 26360-1 long harness, 22381 side terminal battery adapters and parts bag 26396. If you are just swapping trucks, you probably only need the light harness and not the complete kit. But if you need a module too, the kit is the best deal. Make sure you have the green label module for this application. This is the same for Fisher and Western. This is the 4-port isolation module and the 3-plug setup. We also recommend getting a tube of dielectric grease to protect these plugs.

Western went from relay wiring, to 4-port wiring, to 3-port wiring and now Multiplex wiring. We have all of these options available. We will also trade in your old wiring.

Click here to use the Western Power Match to get the correct light harness.

Here is a link to the Western Wiring Schematics Guide.

Here is the list of trucks this kit was used on:

2012, CHEVY/GMC, COLORADO/CANYON

2011, CHEVY/GMC, COLORADO/CANYON

2010, CHEVY/GMC, COLORADO/CANYON

2009, CHEVY/GMC, COLORADO/CANYON

2008, CHEVY/GMC, COLORADO/CANYON

2007, CHEVY/GMC, COLORADO/CANYON

2006, CHEVY/GMC, COLORADO/CANYON Z71
2006, CHEVY/GMC, COLORADO/CANYON Z85

2005, CHEVY/GMC, COLORADO/CANYON Z71
2005, CHEVY/GMC, COLORADO/CANYON Z85

2004, CHEVY/GMC, COLORADO/CANYON Z71
2004, CHEVY/GMC, COLORADO/CANYON Z85

2002, CHEVY/GMC, AVALANCHE 1500
2002, CHEVY/GMC, AVALANCHE 2500
2002, CHEVY/GMC, C3500 SILVERADO/SIERRA
2002, CHEVY/GMC, C3600 SILVERADO/SIERRA
2002, CHEVY/GMC, K1500 SILVERADO/SIERRA
2002, CHEVY/GMC, K1500HD SILVERADO/SIERRA
2002, CHEVY/GMC, K2500 SILVERADO/SIERRA
2002, CHEVY/GMC, K2500HD SILVERADO/SIERRA
2002, CHEVY/GMC, K3500 SILVERADO/SIERRA
2002, CHEVY/GMC, K3600 SILVERADO/SIERRA
2002, CHEVY/GMC, SIERRA DENALI w/4WS
2002, CHEVY/GMC, SUBURBAN/YUKON XL 1500
2002, CHEVY/GMC, SUBURBAN/YUKON XL 2500
2002, CHEVY/GMC, TAHOE/YUKON 1500
2002, CHEVY/GMC, YUKON DENALI 1500
2002, CHEVY/GMC, YUKON DENALI XL 1500

2001, CHEVY/GMC, C3500 SILVERADO/SIERRA
2001, CHEVY/GMC, C3600 SILVERADO/SIERRA
2001, CHEVY/GMC, GMC C3
2001, CHEVY/GMC, K1500 SILVERADO/SIERRA
2001, CHEVY/GMC, K1500HD SILVERADO/SIERRA
2001, CHEVY/GMC, K2500 SILVERADO/SIERRA
2001, CHEVY/GMC, K2500HD SILVERADO/SIERRA
2001, CHEVY/GMC, K3500 SILVERADO/SIERRA
2001, CHEVY/GMC, K3600 SILVERADO/SIERRA
2001, CHEVY/GMC, SUBURBAN/YUKON XL 1500
2001, CHEVY/GMC, SUBURBAN/YUKON XL 2500
2001, CHEVY/GMC, TAHOE/YUKON 1500
2001, CHEVY/GMC, YUKON DENALI 1500

2000, CHEVY/GMC, K1500 SILVERADO/SIERRA
2000, CHEVY/GMC, K2500 SILVERADO/SIERRA
2000, CHEVY/GMC, SUBURBAN K1500
2000, CHEVY/GMC, SUBURBAN K2500
2000, CHEVY/GMC, SUBURBAN/YUKON XL 1500
2000, CHEVY/GMC, SUBURBAN/YUKON XL 2500
2000, CHEVY/GMC, TAHOE/YUKON 1500
2000, CHEVY/GMC, YUKON DENALI 1500

1999, CHEVY/GMC, K1500 SILVERADO/SIERRA
1999, CHEVY/GMC, K2500 SILVERADO/SIERRA