How To Repair Right Rear Turn Signal On 2000 Ml320

Begin by removing the white plastic thumb screw that holds the turn signal to the body of the car.

Begin by removing the white plastic pollex screw that holds the turn signal to the body of the car.
Y'all will find this screw just forward of the within of the wheel well.

With the screw removed, pull the turn signal straight out away from the front of the car.

With the screw removed, pull the turn signal straight out away from the forepart of the car.
Do not pull the signal out and abroad from the headlight housing without first pulling it forwards as shown in the start motion picture. At that place are plastic tabs that fit in the openings highlighted in the second motion-picture show. These tabs tin can be easily broken if this step is not followed.
Once the tabs are clear of their slots you tin can move the tail light away from the headlight housing to get access to the bulb socket and wiring.

Unplug the wiring harness from the bulb socket connexion.
Then turn the bulb socket counterclockwise and pull it out of the turn signal housing to admission the seedling.

While we take the bulb out, y'all can see here that the connexion area between the plug and the socket is rather dirty. Employ a soft metal brush such equally a brass castor, and some electric contact cleaner, to clean the components. The two pictures show before and after cleaning.

Additionally, consider using a soft metal brush such as the ones shown to clean the inside of the bulb socket also every bit the insides of the plug connections to remove any corrosion.

In the involvement of preventing future corrosion consider besides replacing the o-ring on the socket where it enters the housing.
On this car the o-rings were likely original and were fitting very loosely. They were probable assuasive wet to enter the housing.
Find a suitable replacement in your o-ring kit or at the local hardware store.
Glaze the o-ring with a calorie-free blanket of silicone grease to ease re-installation as the new o-band may be a very snug fit. Too, the grease will help better the seal and preserve the o-band over time.

Install your new #1157 bulb in the socket, place the socket back in the housing and plough information technology clockwise to secure information technology, and the keep to reconnect the socket to the plug and re-install the housing in the automobile.
Be certain to test the turn signals before going for a bulldoze. The key will need to be all the way in the "ON" position in the ignition switch for the turn signals to office.

Conclusion

To reassemble your device, follow these instructions in opposite lodge.

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Source: https://www.ifixit.com/Guide/Mercedes+W123+Turn+Signal+Bulb+Front+Replacement/20583

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