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First replace the turn signal light bulb. If that does not work check the voltage at the signal light bulb socket .there should be 12 volts there when youput on theleft turn signal. Normally thefuse for the signal should be for theleft and rightturn signal system. Sinceright turn signal is fune then it cannoy be the fuse.
Check Brake Light Bulbs: All cars have three brake light bulbs that create the brake light illumination affect. If the lower two bulbs fail no lower brake light operation will occur. I know what you're thinking, you might say two brake lights at once? But in reality one brake light went out at a time and you did not notice. People only tend to notice something when they almost run into the back of your car to help persuade them to inform you the brake lights aren't working. Remove either of the brake light bulbs to confirm the bulb is ok or burned. After the bulb has been removed inspect the filament and replace if failed. If the brake light bulbs are ok continue to the next step.
Checking the Turn Signal Switch: Most American cars are designed to have the brake light switch wiring intergraded into the turn signal switch. Because the brake light bulb and the turn signal bulb are one and the same the turn signal switch interrupts the brake light circuit and installs the blinker signal circuit when the turn signal switch is activated. If this switch fails it will not allow the brake light signal through to the brake light wiring. To test for this condition a car repair manual is needed to test incoming and outgoing electrical current. If brake light switch power is present at the turn signal switch but not at any outgoing brake light wires the turn signal switch has probably failed.
The first thing to check is the turn signal bulbs. Assuming those are OK, do the brake lights work? If they do, then double check the light assemblies nearby earth points. Run a wire from the battery (on the +12v on a tail light bulb) and test that the turn signal bulbs do light up. There could be dirt/corrosion in the bulb connector. If all that is OK, there'a failure in the wiring harness. Look under the carpet, driver's side for rust and harness corrosion.
it's the grounds if they're both flashing fast it's definitely grounds take a test light and see if its got power goes through the test light grounded to the frame and if the light comes on then it's definitely your grounds
If you can locate the hazrd flasher unit under the dash on the drivers side, the turn flasher unit should be right beside it and looks the same. Unplug and switch the 2 flashers and see if the turn signals work. The flasher unit is a silver and round. they are usually close to the stering colum. Let me know if that helps.