[Lou Lyman]

I received lots of info here and a link to another board where some electrical gurus hang out. This is what solved my problem:

Any resistance in the wireing harness renders the ammeter inoperative. The firewall connector plug had corroded pins which when cleaned up solved my problem. The connector is to the left of the master cylinder and above the valve cover. Now I can see movement of the pointer so the gauge itself is not at fault. Ford acknowledged in a service bulletin that needle movement was only slight in 1966 models and any movement at all met their specs.

Hope this may help others who have the same question.

Lou

P.S. I learned how to spell "ammeter".