5.1 LED indicator lights
The five LED lights indicate the status of power, communication, and temperature as well as operation states and faults. Use
the LED lights to determine the charge state and troubleshoot the battery charger.
voltage output state LEDRED voltage output state
LEDTemperature LEDCommunication LEDPower
LEDGM87448-
Figure 4 LED Indicator Lights
AC not connected / Fuse open
No communication since power on self-test (POST)
Communication established and nominal
Intermittent or loss of communication after communication has
previously been established
CAN fault (collision, self-removal from CAN bus as defined by
applicable protocol definition)
CAN detected since last power on self-test (POST)
Temperature sensor not connected
Turned off by controller
Temperature compensated output active
Temperature compensation warning due to intermittent or out of range signal
Battery is not connected
Output failure with battery connected
Blown or open fuse
Shorted Output Leads
Under Voltage / Recovery State
Float / Maintenance state
Battery connection reversed
Power On Self-Test (POST)
Figure 5 LED Indications