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Charging system light
08-10-2010, 09:10 PM
Post: #1
Charging system light
Have 2005 Mercury Mountaineer with 73K. 1 year ago replaced alternator with new one and new battery. Charging system light was
coming on intermittenly, battery had bad cell and alt was 11 volts. No problem until now. Light comes on and "chirps" quickly, but does not stay on. May happen once or twice and then not reocurr for a couple of weeks to months. Checked all connections, no corrosion and all tight. When charge ystem system light comes on at night there is no fluxuation in headlights. System has never gone dead and causes no problems, but is annoying. Any suggestions would be appreciated. I take care of my cars and have regular maintenance performed. Car has never given me any real problem and has been pretty much maintenance fee except for normal wear and tear items. Your thoughts??
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08-11-2010, 10:53 AM
Post: #2
RE: Charging system light
I suspect you mean the alt light flickers intermittently so what you need to do is see what the battery voltage is when this happens. It may or may not be an actual charging problem but that dash light is controlled by the voltage regulator so if one part of the regulator is failing I suspect there's more in the future.

One cheap thing you can try on your own is to add a ground wire between the alternator body and the engine block just in case the aluminum case is not well grounded via the mounting hardware. A poor connection here can throw the regulator a curve ball because it's not sensing correctly.
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08-11-2010, 10:22 PM (This post was last modified: 08-11-2010 10:29 PM by Fishman47.)
Post: #3
RE: Charging system light
(08-11-2010 10:53 AM)Rupe Wrote:  I suspect you mean the alt light flickers intermittently so what you need to do is see what the battery voltage is when this happens. It may or may not be an actual charging problem but that dash light is controlled by the voltage regulator so if one part of the regulator is failing I suspect there's more in the future.

One cheap thing you can try on your own is to add a ground wire between the alternator body and the engine block just in case the aluminum case is not well grounded via the mounting hardware. A poor connection here can throw the regulator a curve ball because it's not sensing correctly.

(08-11-2010 10:22 PM)Fishman47 Wrote:  
(08-11-2010 10:53 AM)Rupe Wrote:  I suspect you mean the alt light flickers intermittently so what you need to do is see what the battery voltage is when this happens. It may or may not be an actual charging problem but that dash light is controlled by the voltage regulator so if one part of the regulator is failing I suspect there's more in the future.

One cheap thing you can try on your own is to add a ground wire between the alternator body and the engine block just in case the aluminum case is not well grounded via the mounting hardware. A poor connection here can throw the regulator a curve ball because it's not sensing correctly.

I currently have a "C" chip in the data port to see if the I get some sort of message from the ecm. A friend of mine had my car on an analyzer when it "chirped" but was unable to retrieve any error code from the charging system. I will leave the chip in for a couple of days to see if I get any further hits. He can then download to his computer and see what was occuring at the time of incident. I am keeping a time log. I too, thought about the possibility of a bad/poor ground and will try that. I get no variation of lights whenever this happens at night. There doesn't seem to be any specific circumstance to make it re-occur. Thanks for the info!!
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08-11-2010, 11:09 PM
Post: #4
RE: Charging system light
Good chance there will be no codes in the ECM for that unless the voltage goes out into left field and it could only be a malfunction of the warning light circuit at the moment.

Keep us posted.
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08-14-2010, 09:57 AM
Post: #5
RE: Charging system light
(08-11-2010 11:09 PM)Rupe Wrote:  Good chance there will be no codes in the ECM for that unless the voltage goes out into left field and it could only be a malfunction of the warning light circuit at the moment.

Keep us posted.

An interesting side note; since I put the C chip in the data port, I've not had one chirp out of it.
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