96 seville. thought i had fixed the erratic voltage issue on car. put on new ground strap for battery. cleaned bolt for engine ground. cleaned chassis ground point. voltage seemed steady for 2 months. now it is dropping again. will stay at 14.3 at start. drive a mile and it goes to 13. than drops to 11.2 and slowly will go to 11.1. usually will jump back to 13 and repeat. checked voltage drop thru alternator case. ok there. this is 2nd alternator. acts the same as prior unit. what was the opinion before? lost thread info so i don't recall.