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There's mention of a running light relay and module on the fuse diagram, but I don't know where they are. If someone could identify the locations that would be my next move.
Wiring diagrams are available at GMUPFITTER.COM and use the search function for the PDF for the Electrical manual to find your lights, fuses, etc.
 

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That was a bust, only one technical bulletin on radios.
I don't think you looked at quite the correct section. Need to be in body builder section, then MD models prior to 2007, then 2002 (or newer years if 2002 doesn't have what you're looking for), then c-series electrical. Try 2003 or 2004 if 2002 doesn't have what you want.
 

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