tekin bc 112 c question

[wingnut]

a buddy of mine is trying to get back into racing and all he has for a charger is an old bc 112 c. someone gave him a pulsar but he doesn't have a power supply to run it. my question is the bc 112 c has a supply built into it to power it and the bc 112a. i'm trying to figure out which plug on the back is for the 12 volt cord and which plug is for the bc 112 a so i can plug the pulsar into it and use the 112c as a supply . any help would be greatly appreciated carl