Yep, I understand that part, but what I'm looking for is the actual procedure to set the voltage control to a specific voltage... ie., do you set it open circuit, or under a load, do you set it by setting the pot to a certain number and then watching the voltage rise until the charger goes into the third stage of charging (light blinking), etc., or do you set it by setting the voltage control to a certain number (0 to 100) that corresponds to a voltage on the voltage chart that's supposed to be on one of the pages that's missing from my friend's manual??
A new manual is a good idea. I didn't own one of the newer 3 stage models.
Voltage is set while charging. A 120 volt pack will be somewhere around 3/4 the way to max. I'd just give it all the current you can and watch the voltage. At some point it quits rising and you have to turn the voltage knob up to get it higher (start with the voltage set about 1/2 way so you can work you way up to the target voltage.) 10 amps is a real slow rate for golf cart batteries so getting the bulk charge in is going to take some time. Until the batteries are getting close to fully charged the voltage knob does little, unless its cranked down below than the pack voltage (then it will quickly limit current.)