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Posted on Mar 04, 2010
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Changed battery,alternator and PCM and still wont charge. battery light still comes on.

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  • Expert 306 Answers
  • Posted on Mar 04, 2010
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When the car is off battery voltage should be about 12.5 volts. When the car is on it should be just below 14 but more than 13. If it is then voltage sensing circuit is lying to you. If not then you must check all connections from battery to alternator and starter. When the car is off, does it drain the battery? If so, something other than radio and computer is using power. Electrical troubleshooting can be very complex are you familiar a DVM? (digital volt multimeter) If not you may decide this is too much for a do it yourselfer. You could damage all the electrical system if not careful.

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This cars alternator is controlled by the PCM if the alternator was changed its the wrong one ?check the plugs on the alternator to make sure they are seated properly the PCM controls the charging indicator light
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I have a 2000 dodge stratus. Battery light was on for two weeks then the gages and radio started to twitch we tested both battery and alternator both have been changed we took it for a test drive...

ok that is NOT a battery light, its a CHARGE light!
it comes on and means the battery is not CHARGING.
(the pcm knows this for a fact, in fact IT turned the lamp on.... a key fact.)
any shop can measure the voltage and tell you that in 5 min flat.
he'd
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  2. the meter back to battery terms, and its not 13.3 to 15vdc.
  3. he saw 11v. running. oops. that is WRONG.
  4. so he now knows the alternator is bad, or the alternator hates the battery,(can happen)
  5. on ours we can hot wire the alternator to see it go full on, this is called FULL FIELDING and ALT, i dont teach you that, because you will hurt yourself or car.
  6. The PCM on many cars runs the alternator, in fact there is on inside alt, regulator the PCM does that. so can be bad.
  7. if you had before tested your old battery it would have passed.
  8. if you had tested the old alternate (free in any auto store) it too would have passed, (now they are new) so that leaves wires and and last PCM bad.
  9. your pcm pin C1-8 conrols ALT pin 2. field . at all times.
  10. that wire is dark green.
  11. the alternator is very tricky here( pcm brain side) it will drop the battery charging off line if the battery cables are bad. or any wires related to battery cables, grounds or bad wiring on rear of ALT.
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  13. for current overload, and for OVER VOLTAGE.
  14. that is about it. there is more, but that is all covered in you missing FSM.
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"check gauges" ligh comes on.

i have 08 , and full docs. 06 is pre 07 major changes.
when alternator quiets(i didnt say bad, even the belt can slip or fall off?
the battery is weak, 12.6vdc rested is charged, yours is not charged
and running its 13.4 to 15vdc if not.then its one of these.
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1: bad battery. (one cooked cell and curtains.)
2: bad wiring to altnerator (or it's fuse,.hint?)
3: bad alternator.
4: bad PCM (i think reg is in the PCM. alldata.com, look)

the regulator is designed to not attempt to charge a damaged battery.
this is so the voltage does not spike and blow up $5000 worth of electronics, (new not , wrecker parts prices)

did you fail to scan it, the PCM will report vast numbers of errors. on this . scan the PCM.
see those errors. (bet battery low, and more)
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no engine stated, and that is KEY on call cars.
some have different PCM and charge paths. fact.

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