so i took my pinto for a drive today ran great until i got like 3 miles from my house and the alternator light came on and the amp gauge started to jump 12 to 14 back and forth i made it home thought it might be the voltage regulator so i changed it didn't help it can set at idle and charge at 14 or so but when you go down the road the gauge jumps around and the light comes on as anyone had this problem before I'm thinking i might replace the alternator next but first i wanted to see any cheaper ways it a 71 pinto with the 2.0 a/c 4sp all stock