Be Cool's bullet proof wiring harnesses are designed for simple installation of high performance electric fans. From the easy to follow labeled wiring - which is protected by many weatherproof components - to the connectors, shrink tubing, relays with socket and fuse holder and temp switches where applicable, the Be Cool harness has everything needed to give your fan project the look of a pro installation. Additionally, these are compatible with all domestic or import vehicles, and can be used on 12 volt DC positive or negative ground vehicles with no modifications.