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I wonder sometimes when I read about people having 'issues' with their dash light brightness and stuff if really their lights are just set to 'auto' and the odd time when they turn off or on near dusk or dawn or differing light conditions is the actual culprit. Because my lights, dash lights, and whatnot work flawlessly.
I never use the auto on headlights because I turn on my lights even on a sunny day.I also don't use the auto dim ether. I did notice that I can brighten the dash lights but still not right yet. As for the turn signals. Hell people never use then anyway so I guess it's not stupid any more. LOL
Don't know about your trailer problem but fords signal light system isn't one of their better ideas. Signaling through multiple turns is hit or miss on whether you are signaling the right way. I figured they would have fixed it by now. Hopefully for 17.
I like the turn signals now that I have gotten used to them. The switch to control dash lights is something I still trying to get used to.
The issue with your trailer apparently affecting your interior lights is something that shouldn't happen.