It is an unusual one Bob! What brand is it? It is 'like' the 3G type (mine is 2G) but that would mean a three-pin connector and the major one to the battery, as you say. Like
http://fordfuelinjection.com/public/...ALT_wiring.gif
However, that extra spade connector has me puzzled. Also, your connector (plug socket) seems to be a two pin?
Merv