27781 Isolation Module 4 Port Western Fisher Truck Side Light Harness Green Label DRL

A new 4-Port Isolation Module (part # 27781) for Western and Fisher. This is a direct replacement for 26401 -  the original DRL module used on Chevy. This came in two kits #  8437-1  and # 27780-1.

This module will come in a sealed bag. Once the bag is open, modules cannot be returned.

There are three different 4-port modules and two different 3-port modules.

These modules rarely go bad, so check your wiring first. The newer version is a 3-port but you would need a different light harness to use that.

On the label this says: "PN 27781 PN 27779".

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

Here is a link to the Western Wiring Schematics Guide.