Thanks for your reply.

My problem is in trying to connect my extra (2) Red 10ga leads back to the ammeter, of which I lost track of.

I know which Red one is the supply and goes on the left as you say.
The Black goes on the right.
Shouldn't the remaining (2) Reds be on the right post as well?
Might be a convertable thing?

Interesting that my OE Service manual has the Red & Black ammeter leads switched on the diagram.