If the alternator tests good is the regulator good
The voltage regulator for the alternator is located inside the rear housing of the alternator. It can only be accessed by removing the alternator and dismantling it. If the regulator is faulty it is repair by replacement usually by swapping for an exchange unit from an auto electrician. If the alternator is not charging it may just be a case of the brushes inside the alternator being worn out and requiring replacement.It will still be required to remove and dismantle to carry out their replacement.
SOURCE: were is located the starter in a 1991 lexus ls 400 8 cyl
Under the intake manifold, Big job suggest take it to a shop.
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