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jgriffin187 10-24-2003, 06:55 PM Hi, I have an '03 GMC and I just purchased '04 Chevy taillights. Do you know if I can just add an '04 wiring harness and be good to go? If so, do you know the part number? Thanks!! PS. the plastic doohickies that the bulbs sit in don't fit in the new taillights and the new lights have 4 bulbs, my GMC has 3. dmaxalliTech 10-24-2003, 08:52 PM you will have to change the harness and I will get the part no. Eric jgriffin187 10-25-2003, 09:40 AM Thanks a lot Eric I appreciate it! jgriffin187 10-27-2003, 11:49 AM I just got back from the Chevy dealer. He basically said I couldn't switch my GMC to Chevy taillights because the harnesses aren't compatable. I'm sure I totally believe him. I can make my harness work by shaving the tabs a little bit to get them to fit inside Chevy lamps, but didn't necessarily want to go there. dmaxalliTech 10-28-2003, 09:32 PM Looks like you have to change the harness from the bulkhead connector which is just in front of the rear bumper, all of the rear wiring harnesses plug in there. You will need the harness from there to the lights. Would be 71.00 for both harnesses. Eric | ||