THAT YEAR TOYOTA USED A TIRRILL IC THE INTEGRATED CIRCUIT ITS THE INTERNAL REGULATOR MOUNTED ON THE INSIDE OF ALTERNATOR. AND THE TIRRILL EXTERNAL REGULATOR.ITS MOUNTED ON THE FIREWALL OR FENDER WELL.IF YOU DONT SEE ONE YOU PROBABLY GOT A INTERNAL REGULATOR.IF YOU HAVE EXTERNAL REGULATOR ONE WAY TO TRACE IT IS TRACE ALL WIRES LEADING TO ALTERNATOR.YOU WILL SEE WIRES LEADING TO A LITTLE SQUARE BOX WITH COVER.
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