Alternator

Asked by Kingballz Apr 06, 2019 at 11:18 PM about the 2006 Nissan Maxima 3.5 SL

Question type: Maintenance & Repair

My car recently cut off on me whiles driving I
thought it was the fuel pump but after taking it to
my mechanic I realized was the alternator but the
thing is my battery light never came on so I was
lost and only to find out that my battery light is
suppose to come on when I put the key in the
ignition and go off after a while or when u start up
and I’ve had the car for about a year now and I’ve
never realized this so long story short I need to
know if there’s anything I can do to fix this so that
next time I can see the light and know for myself .
Also the alternator for some reason is over
charging it’s been overcharging from the first time I
put in a new alternator when I first got the car.
Everything my mechanic unplugs the car whiles it’s
running the alternator runs at normal voltage or
what not but once the plug goes back in it starts
over charging again it’s a weird situation but can
anyone help ?

1 Answer
310

XxBigTeXx answered 5 years ago

Voltage Regulator would be first place to check then, Alternator has 3 wires, battery/12V+, regulation, and charge lamp. With the car running unplug the small wires and check them to vehicle chassis ground with a voltmeter. You should see voltage 12-16 in your case on both wires. If you don't then there is the problem, the regulator diode bridge is running, but the voltage regulation circuit is off.

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