My alternator is new, battery is new, but for some reason the alternator won't charge the battery. On of the easiest ways I can tell the alternator is not working is my Holley fuel pump is super quiet...when it is working properly the fuel pump is much louder..LOL. Any ideas?

67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....