Dash Camera Power Adapter (3-Pin) for Mercedes Benz - LED Display USB

In this review of the Dash Camera Power Adapter (3-Pin) for Mercedes Benz, the bottom line is straightforward: this adapter is for Mercedes owners who want a neat, reliable hardwire solution for a dash cam or radar detector without long dangling wires. The single biggest reason to buy is the built-in LED display that reports voltage and current while providing both 5V USB and 12V DC outputs, making it easy to power multiple devices. Reviewers found it compact and easy to tuck behind the windshield sensor cover, and installation uses a special wiring harness so the vehicle warranty is not affected.

Key Features

• 3-pin rain sensor compatibility: Designed for Mercedes Benz models that use a 3-pin connector on the rain sensor; check the sensor before purchase to ensure a match.
• Dual output voltages: Supplies 5V via USB and 12V via DC outputs so you can run a dash cam and other 12V accessories from a single feed.
• Six output cable types included: Ships with DC 3.5mm A and B, RJ11, Micro USB, USB-C, and Mini USB cables to match a wide range of dash cams and devices.
• LED display: The front LED screen shows current and voltage, making voltage monitoring and troubleshooting straightforward.
• Plug-and-play harness: Uses a special wiring harness for an easier install that should not void the vehicle warranty or affect the rain sensor.

Who It's For

This adapter is best for Mercedes Benz owners who want a discreet, professional hardwire power source for a dash cam or radar detector and who can confirm their vehicle has a 3-pin rain sensor connector. It suits DIY installers and installers who prefer to avoid running long power leads and want real-time voltage feedback with the LED display.

It is less suitable for owners of non-Mercedes vehicles or Mercedes models that do not use the 3-pin rain sensor connector, and anyone who cannot access the rain sensor area to confirm the connector type should look for a different harness or seek professional help before buying.

Pros & Cons

Pros

• Includes a variety of output cables so it fits many dash cam models without extra purchases.
• The LED screen provides live voltage and current readings for easier troubleshooting and peace of mind.
• Compact size and wiring harness allow the adapter to be tucked behind the windshield sensor cover for a clean install.
• Plug-and-play connection minimizes risk of affecting vehicle systems or warranty.

Cons

• Only compatible when the vehicle has a 3-pin rain sensor connector, so buyers must verify fit before purchase.
• Documentation relies on a product video for locating the rain sensor cover, which may be inconvenient for some users.

Specifications

Brand	FitDVR
Vehicle fit	Mercedes Benz with 3-pin rain sensor connector
Input voltage	12V
Output voltages	5V (USB) and 12V (DC 3.5mm)
Included output cables	DC 3.5mm A, DC 3.5mm B, RJ11, Micro USB, USB-C, Mini USB
Display	LED screen showing current and voltage
Installation	Special wiring harness, plug and play

Our Verdict

The Dash Camera Power Adapter (3-Pin) for Mercedes Benz is a practical, value-minded hardwire solution for owners who confirm a 3-pin rain sensor connection. Its LED readout, multiple output cables, and compact harness design make it a tidy, reliable way to power dash cams and small devices without visible wiring. For Mercedes models with the matching connector, it offers good functionality and easy installation at a reasonable price.

Frequently Asked Questions

How do I confirm my Mercedes has the 3-pin rain sensor connector?
Remove the plastic cover around the rain sensor as shown in the product video to visually check for the 3-pin connector; compare it to photos or contact support if unsure.

Will installation void my vehicle warranty?
The adapter uses a special wiring harness and is designed not to void the vehicle warranty when installed as directed.

What devices can I power with this adapter?
The adapter provides 5V via the USB outputs for cameras that use USB power and 12V via DC cables for cameras and radar units that require 12V.