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Shop replaced the alternator, but its overcharging,for a minutes and back to normal. mechanic check it with the instrument, came out ok. but it does it again. so how do you diagnose this problem?

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Look for loose or dirty connections. Could be a poor ground connection or could be poor connections at the battery. Clean the battery terminal connections.

Posted on Sep 08, 2010

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Emissions System warning keeps coming on. Mechanic & muffler shop disagree.


Start with the first mechanic who replaced the battery and have them check the charging system. (Alternator) They should have done this when changing a battery, to rule that out as a problem in the first place. Explain the problems you have been having, as a bad charging system can cause all sorts of electronics problems and have them check the engine codes and have them explain what they are.
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1 Answer

Overcharging


I'm going to assume your meter is accurate and you have verified the 18.4 reading.
Something has to be bypassing the regulator to make the alternator charge at full power. The regulator breaks the circuit dozens of times per minute to maintain 14 volts. Does the alternator charge with the regulator unplugged ?

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Charging system lights come on in my Chrysler 300 3.5l. Went to mechanic paid $129 for diagnostics. Mechanic told me the alternator was overcharging. Went and bought a new alternator replaced it myself and...


That is a tough one. Alternators do not overcharge because the alternator is bad. They overcharge because the alternator CONTROLS are having problems. The charging system in your 2005 Chrysler 300 is controlled by the Powertrain Control Module (PCM) Your vehicle needs to be diagnosed by someone who understands how this system works.

Sorry about the $129....I would raise a BIG fuss about that if they told you the alternator needed to be replaced. Apparently, they do not understand how your system works. (It is very difficult to give a correct diagnosis if you do not know how the system works in the first place.)

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2005 ford focus will not start. No clinking noises, no power to anything. We switched out the battery worked for a bout 2 weeks now samething! We try to jump start it but nothing.


Those cars are problematic. A couple of years back, I worked on a 2005 ford focus, and it had a recurring problem. The battery and alternator had been replaced about 3 or 4 times, and the fix would be only temporary. I did a little investigating, and discovered that the alternator was overcharging the battery. Checked all the system wiring, and it was all good. The alternator wiring, however, was melted from the heat apparently caused from the overvoltage. Replaced the affected wiring, and swapped out the alternator, but the damned thing was still overcharging. Unfortunately, I never was able to come to a conclusion as to why the alternator was overcharging. One thing I can tell you is that this charging system is computer controlled by a module in the instrument panel, if i recall correctly. I did not want to pursue the matter any further. If they make the cars any more damned complicated, they will be flying to the Moon!! I was done with it.

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I have a 1994 cadillac sedan deville with a 4.9 engine. The message center in the instrument cluster says the voltage is too high. I have replaced the alternator but still comes on . Maybe you can help me....


The first thing to do is have the battery tested and then the charging system checked, this will show you if its overcharging,if it is overcharging then take a look at the wiring going to alternator,and also a bad battery can also cause a problem so first find out if message center is displaying the correct message, this will show if center is okay then move on to battery testing then alternator test, there may be a problem with the wiring or a defective alternator.

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Battery overcharges and light is on


Never saw a charging system problem cause anyone to fail inspection. But, overcharging will cook the water out of your battery and can damage the computer system if not taken care of. Overcharge can be caused by either a grounded alternator field wire or a bad regulator. Since the condition appeared after replacing the alternator it too is suspect as an internal grounding can also cause that.

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1 Answer

Replaced loose battery terminal and alternator light is now on


If an alternator overcharges, it will most probably spit out electrolyte from the filler caps or vents when run for a time. It may also become quite hot to touch.
Providing the engine is starting OK, and the charge warning light on the panel is not alight or flashing on and off, what you need to do is have a voltage check done on the battery with the engine running. If the alternator is OK, the voltage should be in the vicinity of 13.5- 14.0 volts (13.8 is the accepted "standard").
Any higher, it could indeed be overcharging.
Turning on the headlights should not materially change this voltage.
If the voltage is only around 12V or even less, turn on the headlights, and observe it again.
A low voltage can mean the alternator is not charging.

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You might want to call the dealer.
I think there was a service bulletin to replace the connectors in the back of the instrument cluster

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