Magnum Alternator Wiring

Did you actually ask a question about your car without describing it? 67Dart273 usually jumps on such miscreants w/ "1932 Fordson tractor?".
The answers assume you have a 1971+ w/ the Vreg shown. Doesn't matter which field wire is which. If you have the earlier Vreg w/ 1 field wire, just ground the other field terminal on the alternator.