Not being familiar with the AM myself I can't offer any more advise other than what Bob F. suggested. If there is an experienced person in your area who can help you out. It does seem odd that the indicator will advance under hand cranking but not under the motor drive.

The original manual may be found at tamron's site. I can't find a free manual for the motor drive.
www.tamron.com/assets/pdfs/SQ-Ai.pdf

Dave