a pic would help. It's been forever since I wired my denso, but it's externally regulated just like my stock 1968 alt was. I'd assume yours is too, accounting for two of the terminals (one goes to reg, other gets grounded to alt case. My alt had a special plug for these field wires, but it's from an 02 van and I think it's the first year for that special plug, so yours has the two studs that you use ring terminals and nuts with.

I'm sure someone will chime in here who's got an actual diagram of some sort though.