Okay gentlemen, thank you so much for the guidance here. A volt-meter check a few months ago suggested it was charging okay while running; but obviously not. Maybe the battery was already damaged. So, I will start with the charging system and voltage regulator check, with new battery if necessary. At the same time check the plugs and po18guy's multi-pin connector cleaning. There is enough here to keep me going for a while.
Cheers to you all,
David