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How to Remove the OVP Relay in a Mercedes

Updated July 20, 2017

The over-voltage protection (OVP) relay in a Mercedes is designed to protect the vehicle's electrical systems, such as the anti-lock braking system, in the event of a voltage surge. This relay is mounted inside a small plastic container situated behind the vehicle's battery. It is easily identifiable by the 10-amp fuse mounted under a clear plastic cover on top of the relay. Replacement OVP relays are available from certified Mercedes-Benz parts resellers.

Drive the car onto a flat surface and shift the transmission into park. Turn off the engine and depress the parking brake pedal. Pop open the bonnet.

Locate the OVP relay box. It is made from black plastic and is located directly behind the vehicle's battery.

Remove the cover from the OVP relay box and pop open the clear plastic cover holding the 10-amp fuse to the relay. Remove the fuse from the relay. Remove the relay from the relay box.

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About the Author

Kyle Sanstrom has been writing professionally since 2008. His articles have been published on several websites including eHow and Automobile Insight. Sanstrom has undergone advanced automotive training at the Dunwoody College of Technology, holds an Associate of Arts in general studies from Century College and has more than 10 years of experience in all aspects of automotive repair and diagnosis.