A vehicles power supply module is an intelligent system designed to provide power and to control the ON/OFF of a vehicle based on its ignition status. A vehicles power supply control module is capable of surviving tough car engine cranks as well as transient over-voltage situations. The major role of the power supply is to provide power to a vehicle for its drive. A standard power supply is made up of a lead- acid battery which is constructed from six 2.1 V galvanic cells connected in series providing almost 12 V. In normal operation, the vehicles battery voltage typically varies between 9 and 16 V. Module Only Modules will need to have an exact part match, please provide your exact part number. Modules must be reset by a dealer before installing.