9004,9007 Wire Harness-Double Fuse Boxes 1. double relays and double fuse boxes 2. ISO9001:2008 3. easy ... 1. More Safety: double relays and double fuse boxes, if one of your lights has something wrong ... safety.2. High Quailty: PVC tube protect the wire harness, to avoid jamming-intreferrence, erode-interferrence ... Peeling, Welding, Assembly and Testing. 9004,9007 Wire Harness-Double Fuse Boxes