New 24V audio and navigation installation kit with relay. All items are new, and the DC-DC converter has a 20A fan. Extension processing is already done, but we can also make it shorter if you wish! Compatible with both genuine 2-speaker and 4-speaker vehicles, it operates with the key ACC and turns off with the key OFF. Backup power is supported, so you don't need to reset the clock, memory, etc., even if you remove the key. Although not shown in the image, the illumination wiring will be shipped with a relay attached, so you can use it with peace of mind. The harness uses a 14-pin connector compatible with Hino, Fuso, ISUZU, and UD vehicles manufactured after 2001. Installation is possible if your vehicle is one of the above, but please check the connector shape before purchasing. Please refrain from purchasing if your vehicle has a genuine audio system with Bluetooth functionality, as the connector shape is different. For installation, simply connect the same colored wires to the power cable of the aftermarket audio and remove the genuine audio, then install it in the same way! If using with a navigation system, there is a separate vehicle speed signal on the navigation unit's power cable, so please have a professional confirm the vehicle speed signal connection. We are not responsible for any direct or indirect damages during or after the installation of the product, so please use it at your own risk. We are selling four types of navigation and audio kits: 18-pin 20A, 18-pin 15A, 14-pin 20A, and 14-pin 15A. We recommend 20A for navigation use and 15A for audio use. Truck Navigation Truck Audio 24V Navigation Installation Kit DC-DC Kit ISUZU FUSO HINO UD