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I assuming you're talking about a Ford truck? The easiest internally regulated alternator to install would be a GM 10SI, that was used on GM cars and trucks from the mid-70's to the mid 80's+, or a similar, but heavier-duty 12SI. Hook the present large alternator output wire to the large stud on the Delco, and run a jumper wire from the large stud to the #2 terminal on the alternator. If you now have an "idiot light" in the dash, disconnect the idiot light wire from the old voltage regulator, and connect it to the #1 wire on the new Delco alternator. If you do not now have an idiot light, find a source of battery voltage that is switched "ON" with the key. Run that through a "idiot light" or "side marker light", using a #194 bulb, to the #1 alternator terminal. Alternately, you can put a diode in the wire from the switched 12 Volts to the #1 terminal. For reliability, use a 4 or 5 Amp 1000 PIV diode. The cathode end should be marked with a white band, and that end goes toward the #1 terminal. This basic hookup generally works well. If you want a little more elaborate system with remote voltage sensing, look HERE: Link
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