AVBM II with in car controller for GM 4 pin rectangular
This simple device plugs inline in-between the alternator harness and the plug on the alternator. There is a 6 foot long control cable that runs from the T harness at the alternator to the black control box mounted inside the vehicle. This allows the installer to monitor and adjust the charging voltage of the alternator from inside the vehicle.
Adjustment range on hairpin style alterntors: 14.9 - 15.8 volts.
Adjustment range on standard AD/CS style alternators: 14.9 - 19.0 volts
Fits 4 pin GM oval OEM and MechMan units ONLY. May not be compatible with other aftermarket alternators.