When I'm at a stop n idling the battery gage dips significantly n then comes back up. It then stays up for acouple seconds (10-20) and then drops back down. Each time this happens the battery power gets alittle lower until I start driving again. Am I right when I guess the alternator is going?

 

Could also have a battery with a dead cell. Most parts stores will test both free of charge. I believe you will have to remove the alt for them to test it though.

 

I just got a new bat. Not even a year ago so hopefully that's not the case lol

 

do you clean your motor with a water hose? having same prob, opened up the alt, rust on the brushes. can wait to see, but that is more than likely the prob. at night let it start doing this, with the car running, tape on the alt(BE CAREFUL) and you'll prob see spar

 

sparks inside. you can try electronics cleaner but prob. wont help rust alot. not prof, I know, but I hit mine out of frustration with a channel lock, It stopped for a couple of months! but check with the cleaner

 

go to the junkyard get an alt for like 25 bucks bring it to autozone get it tested if it fails get a print out and go to the junk yard and get another one had the same exact problem junk alt fixed it havent seen it happen again

 

could also be bad wiring/connections between battery,junction,starter,grounds