I wrote AC not A/C
AC = Alternating Current
A/C = Air Conditioner
Alternator produces 3 phase AC current, its the diode pack that makes it DC - then the voltage regular regulates it at 14V - hence 14V DC
For God's sake dont stick a screwdriver onto moving parts - buy a stethescope (mechanic kind) - it costs Rs 200/-
For ghettoing the part I used a thin metal rod in some vacuum pipe then stuck the other end of the vacuum pipe in my ear - much much safer