This fuse is not installed in the factory, but is supplied taped to the trailer brake wiring harness. All of the wires, except for the trailer brake control, run from the fuse block right back to the trailer plug.. All the wire harness makers are coming up with new ones for the 2003's. I'm just avoiding going out and spending $10 on a new.. I would check your owner's manual first under "Trailer Wiring Harness". There's a diagram for the harness. For a 03': Yellow: Left Stop/Turn Signal. I think one of the symptoms of using a 2002 trailer brake controller harness on a 2003 or later is that the brakes may set when you turn on the headlights, and a fuse may blow if you step on the.
![[DIAGRAM] 2004 Avalanche Trailer Wiring Connector Diagram MYDIAGRAM](http://forums.pelicanparts.com/uploads19/Avalanche+Wiring+Diagram+Ignition_Page_113228339371322842436.jpg "[DIAGRAM] 2004 Avalanche Trailer Wiring Connector Diagram MYDIAGRAM")
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