Disclaimer: This modification involves working with electrical components and should only be attempted by someone with proper knowledge and experience. Incorrect wiring can cause electrical damage or even a fire. If you are unsure or uncomfortable with electrical work, it's best to consult with a qualified automotive electrician or mechanic.
1. Preparation:
- Disconnect the negative terminal of your car battery to ensure safety while working on the electrical system.
- Gather the necessary tools, such as a multimeter, wire cutters/strippers, pliers, and electrical tape.
2. Locate Fuse Box:
- Open the fuse box located in the passenger footwell area of your Mercedes C-Class.
3. Identify Fuse:
- Locate the fuse responsible for the cigarette lighter socket. It is typically labeled as "Cigarette Lighter" or "Power Outlet."
4. Remove Fuse:
- Use tweezers or a fuse puller to remove the fuse from its slot.
5. Test Fuse:
- Ensure that the fuse is not blown by using a multimeter to test for continuity. Replace it if necessary.
6. Modify Wiring:
- Locate the wiring harness behind the fuse box.
- Identify the wire that supplies power to the cigarette lighter socket when the ignition is on.
- Cut and splice this wire, connecting it to a constant power source, such as the battery positive terminal.
7. Insulate Connection:
- Securely insulate the newly created connection with electrical tape to prevent short circuits.
8. Test Socket:
- Reinsert the fuse and reconnect the car battery.
- Turn the ignition to the "off" position and verify if the cigarette lighter socket now works.
By following these steps, you should be able to enable the cigarette lighter socket in your Mercedes C-Class even when the ignition is turned off. However, it's essential to exercise caution and thorough testing to ensure that everything is done correctly to prevent any electrical issues.
