Review on Littelfuse FHA200BP ATO Add A Circuit Kit: Enhance Your Vehicle's Electrical System with Ease by Derrick Lowell

Does exactly what it promises. I put in the correct amp fuse and turned on the DVR which is on the same circuit as the radio. Key on = dash cam and radio on, key removed, dash cam and radio off. Great little thing to power up permanently installed (or at least long-term) accessories when you don't want an ugly 12V cigarette lighter adapter plugged into all your devices. Time. Never knew they existed but I'm glad they exist, they have a lot of potential for ugly wiring. , then the black wire from the dashcam attaches to the metal under my dash that forms the dash frame.