Wondering if anyone has / can confirm if the trailer wiring harness on the Y is currently sending power (12v) to the charge/aux pin? This would normally be used to charge your trailer‘s battery via the alternator on your tow rig. I read in a post somewhere that this had been disabled via software at one point. Curious if this is still this way. Regardless, I’m planning to install a disconnect in my trailer between the trailer battery and wiring harness to prevent any attempted charging from the Y. Word of caution, if you plan to do the same just make sure you aren’t disconnecting your electric brake-away brakes (if equipped).
To test if the harness is indeed sending power you could use a multimeter or a simple 12 V probe tester that lights up. When you flip open the door to the harness on your car you would test the two leads that are at ‘1:30’ (upper right) and ‘7:30’ (lower left) positions if that makes sense
. This should also be labeled on the little cover door. Normally the upper right is power in the bottom left is ground but the harness on the Y appears to be mounted upside down so bottom left should be power in this case. If you were to connect the upper right with either the 9 o’clock or 3 o’clock pin you should see some blinking when you put your turn signals/hazzards on.