Hello,
I was just going thru internet and came across car voltage stabilizer, it claims stable voltage for lights and all electrical utilities in a stock car and also claim to save fuel.
how is it used and what exactly does it do?

i have a super fabulous alto 1000cc alhamdulilah, would want to know as i dont want high rpm's on idle mode so the brightness of lights accordingly fluctuate a little when accelerated on idle.
is this the stabilizer usually solution for that?