It could be dirty contacts. It's hard to get all that tan-colored crud out of there.
have you tried replacing the flasher u need to replace the flasher can for the turn signals there are 2 one for hazards and one for turn signals usually found in the fuse box, and cost about 3 bucks
Check fuse Check bulbs--they are double filamented with the smaller for turn signals Replace turn signal flasher--Most common problem
One of the reasons why you may not have turn signals or flashers on the left side of your 1998 Ford Explorer if all the bulbs and sockets are good is you may have a blown fuse. Try replacing the light fuses or visiting an auto parts store to test the fuse to see if it is bad.
Blown fuse, defective turn signal flasher relay, or one or more of the bulbs are burnt out. More than likely if the other turn signals are working the bulb is just burnt out and needs replacing.
Check fuse,bulbs, flasher
you prob need new bulbs
replacing the bulb is easy, just undo the bulbs socket, change the bulb and put the socket back in. if the bulb is good, check fuse, then switch, then wires.
Check the fuse panel it is possible you blew the fuse needed to run the turn signals
check the fuse on the fuse box, the bulbs,or the connections.
Check your fuse box, Your brake fuse is most likely blown.
Bulbs mis-installed, blown fuse, connector not plugged in, wrong bulbs, etc.Bulbs mis-installed, blown fuse, connector not plugged in, wrong bulbs, etc.
Fuse, flasher, switch, bulbs, wires, ignition not on, dead battery,Fuse, flasher, switch, bulbs, wires, ignition not on, dead battery,