Posted by Owen Aaland on January 30, 2016 at 20:25:45 from (216.47.33.169):
In Reply to: 2004 GMC 7500 posted by schrade on January 28, 2016 at 19:05:00:
Unfortunately you are almost on your own when it comes to electrical problems on those (2003 - 2009) medium duty trucks. What is shown for wiring diagrams in the repair manual is often not how the truck is actually wired. Rather than make up a new manual for the new truck model in 2003 GM tried to use the old manual and just make changes where things are different. Unfortunately many of the electrical changes are not correct in the manual. You will also find that the fuses in the dash fuse panel do not match what is shown in the manual. To make it even more of a challenge the placard on the fuse panel cover also does not match how the truck is wired.
Besides being powered through the fuses some of those trucks are wired so that the switch controls a relay rather than directly powering the lights.
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