I have been having charging issues for about a year now. The Alternator will sometimes put out 14v and sometimes 0. I have replaced the alternator twice over the last year and replaced the battery but it still randomly kicks on and off. i installed the external regulator and that worked for me but now im getting random misfires in all cylinders that of course is so bad the engine light flashes. but if i turn it off and restart it the thing runs as smooth as can be for awhile.So my question is what is happening and where should i start? are both of these run by the same computer? Thanks for any help!