my ride has been acting up lately, i noticed that when i drive during night time when the lights are on, my battery is discharging. the lights in the panel gauges dims as well as the horns sounds out of tune. i had it checked and was advised that the alternator was the problem being not able to handle the load and not giving enough charge to the battery causing the power drain.

my alternator btw is 60 amps and i have a headlight that is fitted with 90/100watts bulb. i never had these problems before, with this setup, until lately.

How much is the going rate for the repairs of the alternators, and what are usually the problems or items that needs replacement/repairs with this kind of problem/symptoms? hope i could get some ideas as i dont want to end up being ripped off by some electrical shop attendants or something.

thanks.