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What is your question?
2012 GMC Acadia, rear blinkers only work correctly when I turn the headlights/day lamps completely off. If the lights are on when it's in park and you put either blinker on, both come on. If it's in drive and you put either blinker on, nothing happens. I tried replacing the taillight assemblies, and it didn't help. Fuses are fine too. Brake lights and hazards work fine.
How long has your 2012 GMC Acadia had this problem?
A few weeks
Why would it just affect the blinkers? The brake lights and hazards work fine. Could it be the multi switch inside the column that the turn signal lever is attached to?
Are the brake and hazard lights being test in the exact sam manner as the signals?
Can’t edit on this - - site so I’ll just have to add information as it comes to me. Vehicle wired for trailer towing?
Yes, I have a I haul hitch on there but I put that on the day I got it in 2012.
Ok but the thing is those wires are more prone to failures as they are more exposed to the elements.. Combination switch is a possibility - however: Only *hands-on* testing will allow the culprit to be discovered.
Just for the heck of it take a look at this: https://www.autogenius.info/gmc-acadia-2011-2012-fuse-box-diagram/ I think you really should use that lmk.