Yes , you take one field terminal and ground it to the case using any of the screws that hold it together. Why not just go for a denso alt. It is also a dual field alternator just like a square back. Do the same as above and your charging issues will be over. The mounting is the issue for the denso 90 amp. also upgrade your wiring to 8 or 6 guage to take the load and attach it to your battery terminal on the starter switch on the firewall.