RVC regulator install
The 3 primary reasons for GM’s RVC (regulated voltage control) system are as follows.
1. To increase fuel economy.
2. Extend battery life expectancy.
3. Extend lamp and switch life.
There are 2 different types of RVC systems.
1. SARVC which ia an earlier version, meaning stand alone RVC. This system is identified by a rectangular module on the negative battery cable.
The ASRVC does not incorporate the use of the ECM or BCM (body control module). The module interprets various inputs and controls alternator voltage through the “L” terminal of the alternator.
2. Integrated RVC uses the BCM as an input to collect data from the battery and various other points. Then it communicates to the ECM which makes decisions and controls the alternator output through the “L” terminal. This type system is recognizable by an inductive pick up coil around the battery cable.
Both systems cause various voltage levels, idle boost commands, and load shedding functions as a result of programing and scenario input decisions to maintain a targeted 80% state of charge on the vehicle battery. Systems are capable of up to 3 levels of idle boost and load shedding (when various loads are automatically shut down in declining order of importance).
There are 6 possible modes of operation with corresponding voltages depending on sensor inputs.
1. Charge Mode 2. Fuel Economy 3. Voltage reduction
4. Start up 5. Windshield de-ice 6. Battery Sulfated mode