Remove Fuse and connect a variable power supply to the test points.
Increase voltage to 13.8 Volts.
Adjust Pot till Relay turns on and Blue LED lights. This is cut off point.
Connect a 12 V bulb as load and do the same procedure. At 13.8 V, bulb turns off.
Insert Fuse and connect the input of circuit to a 15 V 5 Amps transformer power supply. Green LED indicates Power on.
Connect output to the battery. Yellow LED turns on indicating that the battery is connected.
When the terminal voltage of battery increases to 13.8 Volts, relay turns on and breaks charging current. Blue LED indicates full charge. Red LED turns off.