Grasping at straws here............try removing the bulb from the right rear turn signal and see if there is any difference. If not, see if there are any codes being stored. Most auto supply stores will check for codes for free. While you are there, have them check you alternator and see what kind of voltage it is putting out, and have the battery tested under load. Be sure to check out the battery terminal posts and clamps for any corrosion . If all that checks out as o.k., I would then check all of the fuses for any type of corrosion. Pull the fuse out, check it with a multi-tester to make sure it is good, use electronic contact cleaner, and then re-insert the fuse. I know that this will take a little work, but it is not costing you any cash at this point. Good luck!!!My 2015 Versa SV sedan has begun losing power when taking off from a stop. It feels like I'm pulsing the throttle. After the third or fourth time experiencing this, I realized I only noticed this happening when I slowed or stopped and made a right turn. Never to the left. Odd?
Today I'm walking away from the car and hit the lock button on the remote and the rear right turn signal doesn't flash. I check and the bulb isn't blown but just barely glows.
Hour later I'm driving on the interstate and make a lane change. As the right turn signal is blinking, the engine is cutting out again. That's when I realized the pulse of the engine cutting out is with the turn signal. Seriously! Can this car get any weirder
My head unit is not aftermarket. I have spliced no wires involving the head unit and have not connected anything to the rear turn signal wire. Only splice is to add back up camera to the reverse light wire.Most likely your aftermarket head unit is drawing more current then the wire you "commandeered" can handle without the wire getting very hot. Not hot enough to totally melt the connector block but hot enough to make the plastic very soft. The Soft plastic allows wire connectors to shift around over time and eventually causing "small" partial shorts. My guess is that every circuit that is acting strangely goes through the same (now slightly melted) multi connector block.
If so, than any disconnecting of wires or trouble shooting that you do, such as disconnecting the power to the head unit will not solve problem as the partially shorted connector block in question is upstream (and still connected to the cars fuse box) from your head unit.
Hope this helps.