The OBDII (On-Board Diagnostics II) port in your vehicle is primarily used for diagnostics. However, it can also provide a small amount of power. This article explores how to safely utilize the OBDII port for powering devices like dashcams, while also addressing common concerns.
Powering Devices via OBDII
The OBDII port is designed to communicate with a vehicle’s computer system for diagnostics. However, it also offers a low-voltage power supply, typically around 12 volts. While not intended for high-power devices, it can power smaller electronics like dashcams.
A common misconception is that tapping into the OBDII port for power could drain the car battery. While this is a possibility if done incorrectly, using a properly designed OBDII power adapter with a built-in low-voltage cutoff switch mitigates this risk. These adapters automatically cut off power to the connected device when the battery voltage drops below a certain threshold (e.g., 11.6 volts), preventing battery drain.
OBDII Power Adapters and Alternatives
Several OBDII power adapters are available online, often marketed as “battery savers” or “OBD power supplies.” These adapters typically include a fuse and a low-voltage cutoff switch for safety. They convert the OBDII port’s power into a usable format for devices like dashcams, often via a USB port.
If your vehicle’s cigarette lighter socket is only powered when the engine is on, an OBDII power adapter is a convenient option for powering a dashcam while parked. Alternatively, if your cigarette lighter socket is always on, you can use a heavy-duty splitter with a built-in low-voltage cutoff switch to power both your dashcam and other devices while protecting your battery. This setup allows you to utilize the cigarette lighter socket for charging phones and other accessories while still providing continuous power to your dashcam.
OBDII Port Power Capacity and Safety
The OBDII port is typically capable of supplying up to 4 amps. Most dashcams require significantly less than this, usually 2 amps or below, even dual-lens models. Therefore, powering a dashcam via the OBDII port should not overload the system.
It’s crucial to use a properly designed adapter to avoid potential issues. Directly wiring into the OBDII port without a fuse and voltage cutoff is strongly discouraged. This can damage the vehicle’s electrical system or drain the battery. Using a purpose-built adapter ensures safety and prevents any negative impact on the vehicle’s electronics.
When using the OBDII port for diagnostics, simply unplug the power adapter. It does not permanently occupy the port.
