Had my rig for a few months and noticing some minor electrical issues. Every once an a while when I take my key out the emergency flashers go on for a few cycles. Seems like this type of issue is usually attributed to a fault in a ground connection. Does anyone have a diagram or information on where these are or how I can identify them? Also the vehicle came with an aftermarket head unit. They did not ground the parking brake wire (found out when I tried to use Android Auto), and I wonder if this could be the cause of these issues?