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If by flasher, you mean the emergency lights it can be found on top of the steering wheel.
Probably Flasher
Defective flasher relay.
The Emergency Flasher Button is located on the steering column. It is labeled Hazard Flasher and is a black piece of rectangular plastic that you slide up to put your emergency flasher lights on (easiest with your right hand) and slide downward (towards the floor) to turn your lights off If you mean the flasher relay unit it should be above the passengers feet behind a plastic cover on the underside of the dash.
In the Montero Sport , there is no relay. The flasher is located on the left dash by the junction block.
Well, if none of them work, (front or back) I'd suspect a fuse or the flasher. Do the 4 way emergency lights work? If so, they operate on a separate flasher and this would indicatethat the turn signal flasher is bad.
Start by checkin all fuses and then go through all your wirein to rear lights and the check build recepticals for wear and corosion..
Replace the turn signal flasher relay.
A short would blow a fuse. I would check the flasher which is under the eash on the drivers side. The emergency flasher is different from the turn signal flasher.
Bad flasher unit, bad relay, bad wiring... any of those.
Depends on the vehicle in question. Some vehicle use only one flasher relay for both the turn signals and the hazard lights. Others use a seperate relay for each one.
It's not a fuse. It is a flasher relay that operates either the signal lights or the emergency 4 way lights.