Oh!
I ** thought ** anything around 12 was ok!

There is 1 strap, from the passenger rear head to the firewall. It's about 1/2 inch wide.
Guy at work suggested a full set of new straps.
Run the big one from block to frame.
Run a 1/2 inch strap from battery to body ( fender )
Replace the old strap from head to firewall.

Looks like a set of straps will be aquire Monday, regardless of present issue.

Alternator possibly too, or is that jumping ahead of the horse?

It's a 1 wire, the original, that was rebuilt like 10 years ago.