psualumni Posted September 9, 2017 Author Report Share Posted September 9, 2017 I used the OEM antenna from a 2010 Cobalt (same one as on my Cobalt SS). All three wires hook up so there is no need to drill any holes and/or add another antenna. Sent from my XT1650 using Tapatalk Quote Link to comment Share on other sites More sharing options...
psualumni Posted May 12, 2020 Author Report Share Posted May 12, 2020 I am doing this same upgrade again on another 2003 Silverado. Does anyone have a harness for sale? If you don't, do you know the GM part number for just the wiring since the kit is no longer available? I can source the XM box and / or wiring from a salvage yard as a last resort. Quote Link to comment Share on other sites More sharing options...
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