Directional light flasher unit location - 2000 Buick Century

that sounds like a shorted flasher unit located in fuse box

The flasher unit is located under the dash, near the steering column. This could also be caused by a faulty ground wire. Check the wiring for broken, bare, or loose wires or connections.

most vehicle use the flasher unit as an emergency flasher light. By pressing the hazard light switch, it powers the flasher unit and connects all flashers together. If it has a light module , have it checked out or check the hazard switch itself.

one relay for both functions , change relay to rule it out as cheaper than new direction switch

Most common cause is the Flasher Unit. It's a plug in module usually located under the dash attached to the fuse panel (may need to unscrew a wingnut to drop down fuse panel). Other cause could be burned out bulb but if you are not getting left or right directionals, it's much more likely that it's the Flasher Unit.

here is the location of the flasher The Turn Signal and Hazard Warning Flasher is combined into one unit called a Combination Flasher (Combo-Flasher) The combo-flasher controls the flashing of the hazard warning system and the turn signal system. An inoperative bulb or incomplete turn signal circuit will result in an increase in flasher speed.
The combo-flasher is mounted to the in-line bracket which is located to the right of the Junction Block. The flasher can be removed by pulling in an rearward direction. The left under panel silencer duct must be removed to access the flasher. The combo-flasher is black in color for ease of identification

No Turn Signal Operation (blinker)The turn signal lights in your car are a basic electrical system that controls the front and rear blinker lights to alert the intended direction of the vehicle. We have listed some of the most common problems and repair troubleshooting tips below:
Troubleshooting Procedure
To start troubleshooting this problem:

• Turn the key to the on position (do not start engine)
  
• Inspect the system fuse located in the fuse panel and replace if needed. If you cannot find the location of the blinker fuse consult your owner's manual or an online repair manual
  
• When a blinker flasher fails it can cause blinker lights to say on, not blink, or not go on at all. To test the blinker system flasher, remove the flasher unit and insert a jumper wire between the two terminals. If blinker stays on in both directions without blinking, replace the flasher. If you cannot find the location of the blinker flasher consult your owners manual or an online repair manual.
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Hi, i recommend testing the switch and flasher module. i will post the testing procedures for both devices. replace the device that is faulty.

To test turn signal switches, use a 12-volt test light to probe for voltage into and out of the switch. The ignition switch must be in the RUN position for the circuit to operate. If voltage is present on the input side of the switch but not on the output side, the switch is faulty.

FLASHER TEST PROCEDURE---

• A test light can be used to determine which flasher is used for the turn signals and which is used for the hazard warning light.
• An easier way is to turn on both the directionals and the hazards. This activates both flasher units.
• By removing one of the flashers, the affected circuit no longer flashes.
• Therefore, that flash unit controls that particular circuit.
• If the turn signals fail to operate and the fuse is good, the flasher has probably failed.
• Occasionally, the flasher does not flash as fast as it once did, or it flashes faster. This is also cause for replacement.
• If it flashes too slowly or not at all, check for a burned-out bulb first.

the flasher is located in the Front seating area, driver side, driver side of steering column, mounted in corner behind instrument panel

If the turn signals operate properly in one direction but do not flash in the other, the problem is not in the flasher unit. A burned-out lamp filament will not cause enough current to flow to heat the bimetallic strip sufficiently to cause it to open. Thus the lights do not flash. Locate the faulty bulb and replace it.

If you have no turn signal operation check the turn signal flasher unit. More often than mot this will be the problem. Your emergency flashers operate on another circuit with another flasher unit. The flasher units are very cheap to purchase and easy to gain access too.

its posable the switch could be bad.