A 1970 ford has a external regulator It's probably possible
to adjust one by ajusting the contact points inside the regulator and I'm assuming it has
a older style regulator but I don't think it...
Build a jumper wire with small alligator clips at each end. Find the "B" terminal on the regulator and attach one of the alligator clips, find the "D" terminal and touch the terminal with the other...