I have been having problems finding wiring and pinout information for this shield. Any ideas on where this information might be? Thanks Miles
I'd wager you can find more info on your shield on the vendor's web page.
Otherwise you should find out the exact model number of your shield, enter that in Google's search bar, and go from there.
Could be almost the same as Adafruit's retired v1 motorshield.
Lots of info on that page.