Honda BF115A, BF130A Outboard Motors Shop Manual., Page 388Get this manual
HONDA Alternator warning system The regulator built in the alternator has the abnormality detection functionWhen it detects either of the following abnormalities, the alternator indicator light turns ON, and the abnormality signal is transmitted to the ECMThe ECM in turn signales the abnormality with an intermittent buzzer sound
Abnormality Stop of power generation Disconnected sensing terminal Disconnected charging output terminal Overcharge-
Description Warning when the alternator is not generating power (e.galternator at stop, open excitation circuit inside alternator, etc Warning when the battery voltage sensing terminal (S terminal) is disconnected (e.gconnector disconnected, open circuit in harness)Warning when the battery charging output terminal (B terminal) is disconnected (e.geyelet terminal disconnected, open circuit in harness)Warning when the battery voltage exceeds the regulator adjustment voltage regardless of the alternator generating the power (protection of battery and other equipment)