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Headlight Switch Replacement
 
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Pelican Technical Article:

Headlight Switch Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$100

Talent:

**

Tools:

Philips head screwdriver

Applicable Models:

Mercedes-Benz W123 (1977-85)

Parts Required:

Headlight switch

Hot Tip:

Be sure to disconnect the battery

Performance Gain:

Working headlights

Complementary Modification:

Check all your bulbs

Replacing your headlight switch is a simple job to perform and a great way to get started on DIY'ing. The switch does not have a modular connection on it so you will have to transfer each wire from the old switch to the new one. When doing this make sure to mark each wire carefully or only transfer them one at a time.

Make sure that you disconnect the battery ground cable before you begin as you are going to be with the cars electronics.

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.

NOTE: We have removed the steering wheel so we could get pictures of wiring but you do not need to remove your wheel to replace the stalk.

Disconnect the negative battery cable (red arrow).
Figure 1

Disconnect the negative battery cable (red arrow). Make sure it cannot make accidental contact with the battery while working.

Remove the five screws holding the under dash panel and remove the panel, please see our article on under dash panel removal for additional information if you need it.
Figure 2

Remove the five screws holding the under dash panel and remove the panel, please see our article on under dash panel removal for additional information if you need it.

With the switch in the off position grab the front knob section of the switch with your hands and pull it straight back and off.
Figure 3

With the switch in the off position grab the front knob section of the switch with your hands and pull it straight back and off.

Due to design changes and previous owners working on the car you may find a host of different nuts holding the switch in place.
Figure 4

Due to design changes and previous owners working on the car you may find a host of different nuts holding the switch in place. Use the appropriate tool for the hardware on your car and remove the nut (red arrow). This nut should not be on really tight.

Reach up under the dash and while pushing the switch (red arrow) back from the front and lower the down with your hand.
Figure 5

Reach up under the dash and while pushing the switch (red arrow) back from the front and lower the down with your hand.

You will need to transfer each individual wire from the old switch to the new one.
Figure 6

You will need to transfer each individual wire from the old switch to the new one. Use a Philips head screwdriver and transfer the wires one at a time. Installation is the reverse of removal.

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Page last updated: Wed 12/7/2016 03:03:56 AM