The 90 amp alternator I used has the standard screw stud for the high current wire, and a push in connector for the other two wires. One wire is sense and goes to the battery. The other is the field and goes to the generator light. Very easy to hook up. You dont need the old external regulator and by just a little wire splicing of about 18 inch wires, you can hook up to the yellow and blue wires on the old regulator. The yellow is the voltage sense, and the blue is the gen light. Just get a small chunk of harness from the junk yard for the small wires. The connector has a third wire, but it plugs back into another location on the alternator. I have included a pic of my install.
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