when driving at night..i just noticed my rpm drops to 600 and sometimes 500 when i switch on my headlights and foglights..when i turn it off it goes back up to 800rpm..whats do u think is wrong?my lights doesnt dim and the engine doesnt stall and everything is normal..strong acceleration..strong ac..it just drops whenever i turn on my headlights and fogs..
need your inputs
and btw my battery is motoloit 2sm gold which is 4 years old na