My signal light switch wont work. What do I need to do to replace it?

You may have a defective turn signal switch.The brake light circuit also runs through that switch.

You replace the turn signal/multifunction switch.

There is a separate switch for the third brake light.
Put on your flashers to ensure that your brake lights are working.
Then first look on your gas pedal linkage to locate the brake light switch.
Gary

I Think your turn signal switch is most probably faulty. So that, you will need to replace it. Please, check the video below. It shows the operations to replace the turn signal switch. I think that the operations are quite similar in most modern cars. Good luck!

How to Easily Replace a Turn Signal Switch - Clio 2 and other Renault/Dacia

http://www.youtube.com/watch?v=JKiy-F8pd6o
How to Easily Replace Turn Signal Switch Clio 2 and other Renault Dacia

the switch in the steering column is broken. you will need to replace it. the contacts are separating when signal arm is moved.

If the bulbs are good I would suspect the Brake light switch.

Brake Light Switch: Testing and Inspection
The brake lamp switch can be tested with an ohmmeter. The ohmmeter is used to check continuity between the pin terminals.
Switch Circuit Identification
- Terminals 1 and 2: brake lamp circuit
- Terminals 3 and 4: RWAL/ABS module and Powertrain Control Module (PCM) circuit
- Terminals 5 and 6: speed control circuit
Switch Continuity Test
NOTE: Disconnect switch harness before testing switch continuity.
With switch plunger extended, attach test leads to pins 1 and 2. Replace switch if meter indicates no continuity.
With switch plunger retracted, attach test leads to pins 3 and 4. Replace switch if meter indicates no continuity.
With switch plunger retracted, attach test leads to pins 5 and 6. Replace switch if meter indicates no continuity.

YOU HAVE TO REPLACE THE TURN SIGNAL SWITCH.BECAUSE WHEN IT GOES OUT.SOME TIMES YOUR DIMMER SWITCH STOP WORKING.IF YOU GOING TO FIX IT YOUR SELF BESURE TO.DISARM AIR BAGS FIRST.

The power goes through the turnsignal switch befor it gets to the tailights.

does it have a coded key?

Hi.
On your 98 Dakota.
Is equipaded with a single Flasher.
If you replace all ready.
Check the FUSE # 10, 15 amp..
On the Fuse box. left side of Dash.
and the FUSE D 25, amp. On engine compartment Fuse box.
Check the proper funtion of the HAZARD switch.
Bacause if the Hazard switch is bad the turn signal don't will work. Match the OLD flasher with the New one.

If after of this still not work.
Remove the steering wheel cover, locate the Turn signal switch connector and with a TEST Light check power with the Key ON
12v. to the RED wire and PINK wire..
If you found 12v. check the connection with the switch.
If the connection is good. you will need to replace the turn signal switch.
But if you don't found 12v. You need to look a an open circuit.
And fix it..

I hope this help on your problem..
Thank you for use fixya...