If sounds like you may have LED lights on the trailer you are towing your 2017 Mazda CX-3 with. What is likely happening is that is a little bit of power on the lighting circuits for the T-Connector # C56300 and since LEDs use next to no power that little bit of power is getting through to the LEDs. I confirmed this with my contact at Curt.
If this is the case then the only things you can really do is just unplug your trailer wiring when you will be leaving it parked for long periods of... view full answer...
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