New 24V audio and navigation installation kit with relay. All items are new, and the DC-DC converter has a 15A fan. Extension processing is already done, but shorter lengths can be made if desired! 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 the clock, memory, etc., do not need to be reset even if the key is removed. 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 you have a new (current) Super Grade or a vehicle with Bluetooth functionality on the original audio. For installation, connect the same colored wires to the power cables of the aftermarket audio and remove the original audio, then install it in the same way! For use with navigation, 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 offer four types of navigation and audio kits: 18-pin 20A, 18-pin 15A, 14-pin 20A, and 14-pin 15A. 20A is recommended for navigation use, and 15A is recommended for audio use, but since the maximum current consumption of navigation is around 10A, you can use 15A without any problems. Truck Navigation Truck Audio 24V Navigation Installation Kit DC-DC Kit ISUZU FUSO HINO UD