Product wiring method: The yellow and white wires are from the relay, the yellow wire is connected to the device, and the white wire is connected to the switch The black wire is connected to the negative pole of the battery; the red wire is connected to the positive pole of the battery.This product is an automotive relay fuse box, using 12V power supply, with a high-capacity bracket, including five 40A JD1914 relays and one 4 Pin RTT7121 relay, and six fuses of 5A, 10A, 15A, 20A, 25A and 30A. The relay fuse box is made of high-quality nylon material, with a flame-retardant shell, each has a precise opening, and an arc-shaped socket is reserved on the make all the wiring neat and beautiful. All the necessary wires of this car relay fuse box are pre-wired and can be connected to the car, avoiding the trouble of wiring. It is more convenient to install and use. This relay fuse box has a powerful insulating shell with waterproof and dustproof top and bottom covers, and the wire opening hole is the outlet of all wires, which can be well connected together for better waterproof, dustproof and fireproof. Product name: Automotive relay box fuse box with leads This car relay fuse box is suitable for all vehicles including for SUVs, SUVs, UTVs, ATVs, RVs, pickup trucks, trailers, campers, boats and more. Material: nylon colour: black Package Contents: 1 x Fuse Relay Block with Top & Bottom Cover 6 x Relays (5 x 40A JD1914 relay+1 x 4 Pin RTT7121 relay) 6 x Fuses (5A, 10A, 15A, 20A, 25A and 30A) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.