First check voltage on your battery with a multimeter a fully charged batt should be 12.6 bolts . Disconnect the battery from the car check voltage, second tyical voltage regulator maintain voltage between 13.5 and 15.5 . 15 when cold and 13 when hot. The regulator allows higher voltage to force electrons into you batt. If batt voltage is under12volts change batt. Is your regulator does not maintain 13 or above change alternator or alt regulator. Good luck
The regulator is part of the PCM, been that way for at least 10 years.
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Refer to the link, but chances are the PCM is defective P0620 OBD II Trouble Code Generator Control Circuit Malfunction...
Testimonial: "The above answer comes from published literature and didn't help me. What I finally verified is that the Turn ON voltage from the PCM to the alternator was being pulled too low. Normally the voltage would measure 5.0 volts when unplugged from the alternator. My bad alternator pulled the ON voltage down to 1.2 volts. This voltage is read on the small red wire at pin B on the back of the alternator. The good alternator I got measured 4.46 volts when plugged into the alternator while running the engine, so there was no trouble code set."
You know I repair cars using something called service manual diagnostic stream, last time I checked that was "published material" Take it to a shop and verify my correct diagnosis, been doing this 50 years and special in automotive electronic control systems diagnostics in which I hold master tech cert.
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SOURCE: how to remove alternator in 2003 buick rendezvous
here is a pdf file showing you how to remove it.
http://www.mediafire.com/?xa0wbaadt3t3tvr
thanks and please rate my answer
SOURCE: where is the starter located on my 2002 buick rendezvous?
a single click usually means the starter. multiple rapid clicks while the key is in start position usually means battery...if battery bad, could be due to alternator, but you likely would have noticed a battery light on the dash while driving before.
SOURCE: installed new alternator and car battery still will not charge.
did you unhook the battery prior to installing the alternator
SOURCE: battery indecator light on on dash
Check to make sure that there's power from the alternator to the battery on the charge-back wire. If nothing's there, then your alternator is junk and you'll have to replace it again.
SOURCE: 2002 sonata 2.4l battery dash light on. replaced alternator. Still not charging
I don't know if your car has an integrated regulator or not; some house the regulator in a section of the alternator case, others mount it remote from it.
The regulator monitors the load and battery voltag,e primitively but effectively, and controls the current flowing through the field winding of the alternator to ground, changing the magnetic field intensity and consequently the voltage output of the alternator.
The 'hot' end of the field is internally connected to the + output, the 'cold' end is controlled by a transistor inside the regulator which, in turn, is controlled by circuitry monitoring the system voltage.
Some alternators can be tested by sticking a wire through a specified opening, actually shorting the controlled end of the field to ground briefly, while monitoring the voltage across the battery, doing this though for seconds only.
This essentially bypasses a suspected defective regulator; this causes the output voltage to rise instantly to its maximum of ~17 volts if the alternator is OK.
I don't recommend poking a wire at random into an available opening so having a service manual (Haynes-Chilton) would be nearly mandatory.
http://engine-codes.com/p0620.htmlForum CodePossible causes- Failed Generator/Belt 816 views
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