Yuasa YUA1203000 El Manual Del Propietario página 13

1. No LED lit.
AC end is not making a good connection.
Check for poor connection at AC side.
2. Green LED keeps blinking.
Clamps are not making a good connection.
Check for poor connection at battery and frame.
3. Yellow LED illuminated right away when connecting
a. Incorrect battery voltage.
b. Battery is at full charge capacity
a. Determine if the battery is a 12V battery. The charger will
give you a warning if you are connecting to the incorrect
application.
b. The battery is currently at full charge and will continue in
maintenance/float mode until voltage drop occues. At the time
of voltage drop, charger will resume in maintenance charging
mode.
NOTE
2