Picture 1. The modified version of the power supply
Picture 2. Plastic cover of the terminals needed to be removed.
Picture 3. Pins assignments
Picture 3. Bottom view of the PCB for the control pins assignment. Connect pin 3 & 4 to turn on the PS via a switch. Connect a 5 kOhm variable resistor between pin 17 and ground to adjust the output voltage to maximum of 13.6 Volt. If the output voltage increase more than 13.6 Volt, the PS would be shutdown as it is protected from over voltage above 13.6 V DC.
Picture 5. Connecting groups of positive and negative terminals.
Picture 6. Adding a switch to pin 3 & 4 for on-off control, a 5 k Ohm variable resistor between pin 17 and ground for voltage adjustment and a 1.2 kOhm resistor for LED indicator.