recently my 87 cutlass 305 started having charging issues. i cleaned all the contacts so thats eliminated, and i dont have a baattery load tester. basically whats happening is i start the car, and it'll be charging at 14.4, then randomly it'll go down to 13, and then eventually it'll drop to 12 volts and slowly begin to die. then out of no where jump back up to 14 again for awhile. so before i go and buy a new one, is there any possibility the battery has a bad cell, or does this sound like the brushes in the alternator are gone? im leaning towards the brushes but i think ill check out the water in the battery first. thanx for any advice!