Hi Tunk
Ok, now for jump start, I did a jump start for a friend of mine (He has a 4 wheel drive and his battery seemed to be dead). But that was like 2 weeks ago, but i experienced nothing!!

Currently, when i start the car, as i said I hear the engine tries to start, and the first run is good, then the second turn sounds very week and in the third turn the car starts. (This is what i hear in one start).

Now, i can arrange a multimeter, but isn't it what's important the current rather than the voltage? and what is the appropriate voltage reading?
Many thanks