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Flasher Switch and Relay Replacement
 
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Pelican Technical Article:

Flasher Switch and Relay Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$35 to $200

Talent:

**

Tools:

Philips head, flathead screwdriver driver 10mm socket

Applicable Models:

Mercedes-Benz W123 (1977-85)

Parts Required:

Relay or switch

Hot Tip:

Do not try pry the switch out from above

Performance Gain:

Working turn signals and flashers

Complementary Modification:

Detail the center console

If your four way flashers have stopped working and you are wondering whether it is the switch or the relay, simply turn on the turn signals. If the turn signals are not working then it is the relay and not the flasher switch. Replacing the relay is easy once you actually get access to it. Like several relays in the W123 you are left to wonder why Mercedes put it where they did. The flasher switch itself is also easy to replace. Just do NOT try and pry it up from the lower center console; you will eventually get it out, but you will also most likely end up damaging the wood around it.

Over the years your car may have been serviced by multiple people including previous owners and this can lead to parts replaced with different size fasteners and hardware. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches. If something is different on your vehicle please let us know and share your info to help other users. If you have any questions or comments or even a different procedure you would like to share please leave it below and please leave your vehicle information.

Both the relay and the four way hazard switch are located in the lower center console.
Figure 1

Both the relay and the four way hazard switch are located in the lower center console. The switch is located just behind the gear shift (red arrow). If you are replacing the switch do not try and pry it out from the panel from above, you will just damage the wood. The turn signal and hazard relays are located under the panel just in front of the gear shift (yellow arrow). To replace either or both you need to remove the lower center console.

While there are no visible forms of retaining the console in place, it is very easy to remove.
Figure 2

While there are no visible forms of retaining the console in place, it is very easy to remove. Begin by setting the parking brake and putting the transmission in neutral. Next open the ash tray and press down on the center clip (red arrow) until you can pull the tray all the way forward on out from the opening.

Use a Philips head screwdriver and remove the two screws at the back of the ash tray housing (red arrows).
Figure 3

Use a Philips head screwdriver and remove the two screws at the back of the ash tray housing (red arrows).

Pull the ash tray housing out; if your vehicle is optioned with an ash tray light make sure to disconnect the electrical connection on the left side (red arrow).
Figure 4

Pull the ash tray housing out; if your vehicle is optioned with an ash tray light make sure to disconnect the electrical connection on the left side (red arrow).

Push the center panel a little forward and then lift it up (red arrow).
Figure 5

Push the center panel a little forward and then lift it up (red arrow). With the front section up slide the panel to the rear; there should be a small plastic stud that sits in an opening in the center console that you need to move it far back enough until it clears. Some vehicles may be missing this stud as lots have been broken off over the years by people not knowing it was there.

Gently lift the panel up on one side and disconnect the window switches first (red arrow), this will then allow you more access to separate the other wiring connections.
Figure 6

Gently lift the panel up on one side and disconnect the window switches first (red arrow), this will then allow you more access to separate the other wiring connections.

You can see in this picture that our project cars panel is missing the stud (red arrow) that usually sits in the opening in the console (yellow arrow).
Figure 7

You can see in this picture that our project cars panel is missing the stud (red arrow) that usually sits in the opening in the console (yellow arrow). With everything disconnected simply push in gently on the tab on the back of the switch and then push the switch out through the top (blue arrow).

Figure 8

With the cover panel removed you can access the shifter cover; the relay is just in front of this

Use a small flathead screwdriver and carefully pry out the shift cover light (red arrow).
Figure 9

Use a small flathead screwdriver and carefully pry out the shift cover light (red arrow).

Next, use a 10mm socket and remove the three 10mm bolts holding the cover over the shaft.
Figure 10

Next, use a 10mm socket and remove the three 10mm bolts holding the cover over the shaft.

You do not need to completely remove the shaft and cover, just lift the cover up and spin it out of the way; I only removed the cover to get a better picture.
Figure 11

You do not need to completely remove the shaft and cover, just lift the cover up and spin it out of the way; I only removed the cover to get a better picture. With the cover out of the way you can access the relay (red arrow).

Simply pull the relay straight out from the connection and insert the new one.
Figure 12

Simply pull the relay straight out from the connection and insert the new one. Installation is the reverse of removal.

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