If the Curt T-Connector # C55364 is making the lights on your 2004 Chrysler 300M go dim without a trailer hooked up and you have installed everything (including the ground) according to the instructions, then I would say you have a defective harness as well. Before purchasing a new unit (or claiming the warranty on this as it comes with a 1-year limited warranty), I recommend just double checking your ground connection as well as the OEM connectors on your vehicle. If any of those connectors... view full answer...
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