Don't know what ideas you had before......but I would suggest replacing the red hot lead to the battery from the alternator and the fusable link by the main engine fuse box. Otherwise, you will have to list the previous suggestions. Hope this helps you. Using a voltimeter, you can check for a fusable link issue. Touch the voltimeter red to red and black to black on battery. Then touch black to black on battery and red to red connection at alternator. (The reading should be basically identical showing continuity between alternator and battery through the hot lead (red) and fusable link. Hope this helps you.