I have a 1968 SS 396ci, so my original problem was my alternator was not charging. So I put in a new alternator in and it done nothing to rectify the issue. So I rewired my wiring which was burnt and I put a larger wire in and also an external voltage regulator and horn relay. Now my problem is my output to the battery is 15-16 volts. What is causing this problem and what is the fix?