Charging good but battery light always on

Tiny
BOBNICH
  • MEMBER
  • 2013 CHRYSLER TOWN AND COUNTRY
  • 3.6L
  • V6
  • TURBO
  • 2WD
  • AUTOMATIC
  • 99,000 MILES
Alternator stopped working last week so I replaced it. Everything was fine for two days but then battery charge light came on and always stays on. Battery keeps its charge and measures 12.75 volts before driving. With motor running it reads 14.0 volts and stays charged. Don't know what the PCM reads to turn on light.
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Wednesday, June 19th, 2019 AT 11:42 AM

3 Replies

Tiny
SCGRANTURISMO
  • EXPERT
Hello,

Did you have the correct alternator installed? This sounds like it could be going the other way and is overcharging your vehicle's battery. I have included the alternator specifications as well as a description of how your vehicle's charging system works in the diagrams down below. Please go through it and get back to us with what you are able to figure out.

Thanks,
Alex
2CarPros
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Thursday, June 20th, 2019 AT 2:34 AM
Tiny
BOBNICH
  • MEMBER
Great response. That is exactly the information I was looking for. Now, is
there a place that I can monitor the voltages at refs #3 and #10 to know
for sure? It looks like I can probe at the fusebox for ref #3 but probably
can't find where to probe #10. If I could find a place to probe #1 I could
monitor it with a scope and see what is happening.

On my old Dodge Caravan I could hook my OBDII reader to laptop and read
program memory and find the stored values when someone published the
locations online. With the more modern cars I can't find any such info
(and my old spec 9141 interface won't read cars after 2007 anyway).

Since the circuit consists of only alternator, battery, TIPM, and PCM
and all was good until alternator failed, it seems to me the new alternator
is the problem. According to Advance Auto Parts it is the correct one and
the specs published online indicate that.

Most valuable to me would be would be a wiring diagram showing the wires
and connector pin numbers were I could probe.
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Sunday, June 23rd, 2019 AT 12:26 PM
Tiny
SCGRANTURISMO
  • EXPERT
Hello again,

I have included the information that you requested in the diagrams down below. Please let us know what you are able to find out.

Thanks,
Alex
2CarPros
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Sunday, June 23rd, 2019 AT 6:39 PM

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