Abstract: According to one embodiment of the present invention, there is provided an arrangement and method for providing power to an electrical system and to at least one auxiliary power outlet used to provide electrical power for auxiliary equipment, such as welding equipment, lighting equipment and other auxiliary electrical equipment, as well as providing a booster outlet to charge batteries such as vehicle batteries when the arrangement is used on board a vehicle. The arrangement and method utilizes an alternator used, in one embodiment, to charge at least one battery for the electrical system and switches the output of the alternator between a battery charging mode of operation and an auxiliary power mode of operation. The arrangement of the disclosed embodiment of the present invention includes a voltage regulator such, for example, as a pulse width modulation circuit for the alternator.