once i had that problem, after i changed the alt and reg, it stopped charging...i had to put a capasiter (sp?) on the regulator....i noticed my 78 had this thing on it but my 76 didnt....i just swapped it over and it has worked fine since...if your regulator dont already have one, there will be a yellow wire that isnt hooked up on the regulator, thats what it hooks to....i hope this helps....