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Member
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Join Date: May 2009
Location: bradford,ma
Age: 54
Posts: 805
Real Name: brian
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Member
Join Date: May 2009
Location: bradford,ma
Age: 54
Posts: 805
Real Name: brian
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First thing is do the basics, check battery terminal connections even under the ends. There may be corrosion and you can't see it. Happened to my dad on his Lexus RX. Would not charge, voltage was low, would not jump off a booster pak. I took the cable ends off the battery and corrosion was everywhere. Cleaned everything and it started right up and got 13.5v with my tester.
As far as I remember when an alternator output goes below 12.8 the diode trips the light( some manufacturers have different trip points ). So your alternator may have a bad windings, brushes or a bad voltage regulator.
Like I said do the basics first, it might be that simple.
Good luck.
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'08 4Runner Limited V8 Shadow Mica: Sport hood, bilstein 6112's, 5160's, b12 coils, Gibson cat back, 4runner XSP rims, Michelin X LT AS 275/55-20
'06 4Runner Limited V8 Salsa Red: bilstein 6112, 5160, Wheeler T12's, 4Runner XP wheels, Michelin AT2 275/55/20, Magnaflow Exhaust,, Powerstop brakes, sport hood
RIP.....'08 4Runner Limited V6: white, bilstein 6112s, 5160s, b12 , powerstop brakes, nav, TRD cat back, 4Runner XP rims, Michelin Defender LTX 275/55-20, sport hood
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