GXL wire has a temperature rating of -59 degree F (-51 degree C) to 257 degree F (125 degree C) and is resistant to moisture, grease, oil, gasoline, most acids and solvents. Each wire is color-coded and labeled for easy identification during installation and to simplify even further all wires are attached to the fuse block. Every attached terminal is machine crimped and hand-soldered making the best connections possible. Each fuse block includes a horn relay, turn signal relay, hazard flasher and standard ATO fuses. Wiring harnesses will work with a dash mounted or steering column mounted ignition switch and also have optional connectors for common GM-style accessories, such as dimmer switch, hazards, and alternator. For vehicles that don't use GM accessories, simply omit the extra connectors during installation. The installation instructions show how to make all connections for GM, Ford, and Chrysler vehicles.