Battery gauge

Tiny
BILLY BRADFORD
  • MEMBER
  • 2000 DODGE DURANGO
  • V8
  • 135,000 MILES
Check gages light comes on and battery gauge is maxed out at 18. Goes back to normal and then it does it again
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Wednesday, February 16th, 2011 AT 8:33 PM

10 Replies

Tiny
MMPRINCE4000
  • EXPERT
Have charging system tested at most autoparts stores, but sounds like the alt. Is bad.

Overcharging the battery can cause it to explode.
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Wednesday, February 16th, 2011 AT 8:35 PM
Tiny
RASMATAZ
  • MEMBER
Sooner or later its gonna blow at that high-BTDT and it scared the heck out of me-thought I got hit with an RPG, the regulator is not controlling the alternator-
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Wednesday, February 16th, 2011 AT 8:45 PM
Tiny
CASSIL
  • MEMBER
My battery gauge goes to 19 and after I turn jeep off and back on it works fine for a while. I have had alternator and battery tested. Both test good?
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Saturday, February 25th, 2017 AT 8:39 PM
Tiny
CARADIODOC
  • EXPERT
You need to start a new question, and PLEASE! List the engine size and mileage. This was an old conversation between a few people, and as you can see, when you piggyback on it, no one is going to see it or have a chance to reply. That does you a disservice. On our list it shows up as having received a reply already.

This is not an alternator problem. It is working too well, and that is the fault of the voltage regulator or the wire going to it. The regulator lives inside the Engine Computer and does not cause much trouble. The place to start is by monitoring the voltage on that control wire while the problem is occurring. Its important to know that if the voltage regulator circuitry is totally shorted inside the computer, it is incapable of drawing the voltage down to 0 volts. The lowest it can go is around 2 - 3 volts. If you find the voltage dropping to 0 volts, that wire is rubbed through somewhere and is grounding out.

There's two small terminals on the back of the alternator. They will only have voltage while the engine is running. One will have full battery voltage on it. It's the other one you need to monitor. It will have less than battery voltage, but should not have 0 volts. Typically you'll find between 4 and 11 volts. The lower that voltage, the greater the difference is between the two of them, and the stronger the electromagnet will be.
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Monday, February 27th, 2017 AT 12:10 AM
Tiny
STEPH HANCOCK-NELSON
  • MEMBER
  • 2002 DODGE DURANGO
  • 5.9L
  • V8
  • AWD
  • AUTOMATIC
  • 184,000 MILES
Just the other day the I drove my truck to work and it was running fine. About a hour later it would not start. Finally started and I saw that the battery gauge was at the low position. I changed the alternator and the battery and it is still at the same position, but the battery is getting overcharged. I was driving home today and my headlights were getting dim and the break, ABS and airbag light came on. The went out a short time later but the brake light and ABS light come on and go out, but the battery gauge stays on low. Now I can smell the battery. Also, my engine has trouble starting and idles rough and the RPM goes up and down. Now my truck will not lock with the switch or the alarm, but will unlock. What could be the issue?
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Saturday, March 4th, 2017 AT 10:54 AM (Merged)
Tiny
KHLOW2008
  • EXPERT
Did you test the charging rate? If the alternator is producing good output but the battery is not getting it, you have a failed connection between the alternator and battery. It could be a faulty fusible link.
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Saturday, March 4th, 2017 AT 10:54 AM (Merged)
Tiny
STEPH HANCOCK-NELSON
  • MEMBER
The battery is getting overcharged.
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Saturday, March 4th, 2017 AT 10:54 AM (Merged)
Tiny
KEN
  • ADMIN
Hey STEPH,

Please check all battery grounds to make sure they are clean and tight. This sounds like there is a problem with the PCM which controls the alternator and the other items you have described. Here is a wiring diagram of the alternator so you can see for yourself. Also check all fuses and the fusible-link as KLow has suggested.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

You will need a good used one or a new one.

Please let us know what happens.

Best, Ken

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Saturday, March 4th, 2017 AT 10:54 AM (Merged)
Tiny
STEPH HANCOCK-NELSON
  • MEMBER
It was the computer. But is also cooked the battery and burned out the cluster and wiring
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Saturday, March 4th, 2017 AT 10:54 AM (Merged)
Tiny
KEN
  • ADMIN
Glad you could get it fixed please use 2CarPros. Com anytime we are here to help

Best, Ken
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Saturday, March 4th, 2017 AT 10:54 AM (Merged)

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