Could be the the relay under your dash. There is a YouTube video on it. It is pita to change out. You can buy the relay in AutoZone for about ten bucks and hope it fixes your problem. When I signal to make a turn the signal stops working after like 3 or 4 blinks. The relay fixed mu problem.Hi all, Recently gifted a 2002 Explorer Sport to my daughter for high school graduation. We are having a few electric gremlins, most importantly an intermittent driver side brake/turn signal not working. Is this a common issue? Used a test light on the plug and trailer socket, brakes for driver side does not work on either the brake socket or trailer socket. Can't seem to locate the connection for these under the truck. Does anyone know where it might be? Thanks in advance.