zzmac I didn't ask you how old the mustang battery was or the CCA of it. As Far as the battery tests, the out come on the mustang battery was 12.4-12.6 and needs a charge? What was the CCA load. If this battery is 3-6 years old, it is getting to the end of the party depending on how many months it's rated. As far as the Alt and charging, Put a 1 hour cruise on it and then tell me it's OK. There is no 100% test for either of these parts. Gald the car is starting quick, keep an eye on the charging now. Good luck. Keep jumper cable in the trunk just in case.
Rick L. Ps no faith in me, must be a SPF thing. LOL