This is a reinforced relay harness for vehicles that require long wiring, such as large vehicles, wagons, and minivans. "The fuse blew after I replaced my fog lights with bright LEDs..." "Even after replacing the fuse, it blows repeatedly..." If you have this product, you can solve such unexpected situations in an instant!! This is a power-boosting relay harness to solve fuse blowing when replacing LED fog lights. It supplies current directly from the battery.