2004 GMC Yukon Owner's Manual - Page 375

2004 GMC Yukon Manual

Page 375 highlights

Instrument Panel Jumper Wiring Harness {CAUTION: Be sure to use only the correct trailer brake harness, the one intended for use on your vehicle. If you use some other trailer brake harness, even if it seems to fit, your trailer brakes may not work at all. You could have a crash in which you or others could be injured. Use only the trailer brake harness intended for your vehicle. If it is no longer available to you, be sure to get a proper replacement from your dealer. This harness is included with your vehicle as part of the heavy-duty trailer wiring package. This harness is for an electric brake controller and includes a trailer battery feed fuse. It should be installed by your dealer or a qualified service center. This harness is new for your vehicle, and you will not be able to use a harness from an earlier model year. 4-77

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