BGS 2189 Battery and charger system tester

for fault diagnosis of 12-V battery and charging systems easy to use, just connect and check indicator lights LEDs are electronically controlled 3 LEDs for battery test: LED red = battery empty or defective / LED yellow = battery OK / LED green = battery very good 3 more LEDs for alternator test: LED green = charging system OK / LED yellow = charging system OK (maximum charging voltage) / LED red = charging system is not OK (it may damage the battery and other parts of the electric system)