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Turn signals are one of the easiest systems in your car to troubleshoot. Your signal flashers either work or they don't. If they don't, either you need to change the bulbs or you need to replace your turn signal relay. Know more about car diagnostic tools for automobile.
The turn signals and hazard flasher should be on two different circuits, so I doubt a fuse would be the problem. The multi-function switch in the column is the only thing I know of that would affect both. A mechanic would test the circuits at the harness plug.
Yes, it does have a flasher, although it may be a combined unit with the hazard flashers relay. So you hear the clicking of the flasher relay? That seems to indicate the relay is working properly. Have you checked the bulbs and the turn signal fuse? Any turn signal bulbs light up anywhere, front or back?
How about your brake lights, do they work? Your car may have separate, stand alone turn signals in the rear, but many American cars use the same bulb and same filament on the bulb for the brake lights and turn signals. If your merc is like this and the brake lights work, then the bulb must be good. Turn on the hazard flashers and see if all bulbs work and flash at each corner of the car. This would be the same bulb as for the turn signals. If they work, it could be a bad turn signal switch, may even be the flasher relay somehow malfunctioning, and in a few cases, a bad hazard switch can affect the turn signal switch. Check fuses and bulbs first. If you have any type of body control module that controls lights and other accessories, you may have to investigate that. I know I'm not being very helpful, just throwing out a few suggestions. Good luck.
check the fuse if good then turn on the hazard lights if they work then you probably need a turn signal flasher which is a separate flasher unit then the hazard one.it usually looks like the hazard one so with the hazards on and locate it then you will know what the signal flasher looks like and you will also know not to change the wrong flasher unit.the signal flasher is often located at or near the under dash fuse panel or somewhere in the dash you don`t say what type of car your talking about.
Your vehicle has 2 flasher relays. One for the turn signals and one for the hazard lights. The turn signal flasher relay is located on the drivers side, under the dash, mounted on the drivers (Left) side of the steering column. The hazard flasher is mounted on top of the steering column. Do not get them mixed up.
since you know where the fuses are, you also know where the flashers are. the flashers are the same part so unplug the one for the emergency flasher and put it into the socket for the turn signals and vice versa. if the signals now work but not the emergency flasher you know to get a new flasher unit at any parts store. the flasher units are cubes about an inch on each side plugged into the fuse panel.
you don`t say but do the lights work either on the front/back on both sides.if not then it may be a fuse that needs replacing or need a bulb replacement.if the lights work but don`t flash then it sounds like a signal flasher problem.the flasher is located in the fuse panel under the dash on the drivers side.if the hazard flashers work then turn them on to find the hazard flasher by the fuse panel then you will know what the signal flasher looks like and change the signal flasher.make sure you change the one for the signals and not the hazard one.if the hazards work then i would say the signal switch is good as the hazards work through the same switch.
the hazard lights use a different flasher(relay)then the signal lights.you don`t say if the signals work on one side or not,you should check the fuses for the signal lights in the fuse panel under the dash on the drivers side.if you put the hazards on and find the flasher then you will know what the signal flasher will look like,it is on the fuse panel and replace they should work.