[vettestr]

I checked your photos and it is blank but I was trying to see if you are carb'd or injected. If carb'd and no computer ECM to harm then a cople tests will get you on the correct path.
When running you can disconnect NEG. battery cable and see if engine runs or dies. If it runs your charging system is supplying demand, id dies it is in fact overcoming supply and pulling from the battery. Be careful of sparks etc.. Turn engine off and hook up cable. You can now place a meter in series with the battery cable to fans to verify actual current flow but watch polarity taking reading. Be careful about this reading and meter quality and lead size. There are many inductive type meters out there that are much easier.