Unbolt the old external regulator from the radiator support.
Cut the small red wire from the old regulator to the horn relay. Remove the black ground wire that ran between the horn relay and the old regulator. Cut the brown wire running from the dash light to the external regulator, cut it at the external regulator. Only the brown wire from the original external regularor harness will be retained. The old regulator and the rest of the old harness are no longer needed...give em to a 100 point restorer or toss em in the trash.
With the old wires that used to run from terminals 1 and 2 of the old alternator and the wires cut above, remove the unneeded external regulator harnerss.
Solder the brown wire from the dash light to the small lead (#1) of the new 12SI pigtail. Solder the sensing wire you bought to the large wire of the new 12SI pigtail, (#2)
Route the sensing wire from the alternator terminal 2 along the Batt wire and connect to the + terminal of the battery. Reconnect both posts of the battery.
Check all connections, wrap the harness and turn the key, Gen light should glow, start the motor, Gen light goes out...check voltage at the battery terminals, it should be 14.5 volts if its working right.
Thats it, go drive....we'll be drivin on these soon...
