Although rare, a few high-powered stereos require you to make a direct constant power connection at the positive terminal of your vehicle's battery. This requires a heavier gauge power wire, an in-line fuse (usually included), and a ring terminal to connect the power wire to the battery clamp. You will have to route the power wire to the battery location, which is often through the vehicle firewall and into the engine compartment in order to make the connection at the battery.
If your new stereo has a video monitor built in, you will also need to connect a wire to your emergency/parking brake wire. This wire acts as a switch to turn on the video monitor when the parking brake is engaged.
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