Voltage Regulator : The voltage regulator does what it sounds like, it regulates voltage on your car. A voltage regulator usually keeps the voltage regulated at 14.5 volts however there are some vehicles that may regulate the voltage at a different range. Some voltage regulators are external of the alternator and some voltage regulator’s are built inside the alternator. Some vehicles may have a voltage regulator built inside the engine computer causing you to have to replace the entire engine computer if there is a voltage regulator failure. Regulation is achieved by turning on and off the current very rapidly to maintain the desired voltage. If there is a voltage regulator problem, the vehicle’s battery may not get properly charged. If the voltage regulator is malfunctioning and is built into the alternator, the entire alternator must be replaced. If the voltage regulator is built into the engine computer, the engine computer will have to be replaced and in most cases reprogrammed. Call Guy’s Automotive and get a quote on replacing your voltage regulator, alternator or engine computer today.