1998 Cadillac Deville Service Charging System on 1998 Cadillac DeVille

We bought a 1998 Cadillac Deville from a auction and its in really great shape. But it started acting up.It acted like it didn't want to start and then it finally did. So i started to drive it, and it sputtered alittle. I brought it back home and parked it in the garage. Went to start it the next morning and it wouldn't start. My husband checked the battery with his amp machine. It was reading 11.0 and he went and bought new batttery and amonth later same thing. Replaced new battery with newer battery and 16 days later same thing. Died as he was driving it! So he thought the battery was bad one's from walmart. Took it back and got money , replaced with new battery again from advanced auto. Still reading was real low, so he took alternator out and avanced checked it and said its good, husband bought new one and put on car and still says "Service Charging System". New alternator or battery didn't help! Please could you give some advice? The car reads 11.4 on dash for the battery amps. Still says Service Charging System Error on dash also. Thank you for your help...

by in Elkton, MD on May 15, 2011
2 answers 2 comments
ANSWER by on May 15, 2011
The charging voltage is low, across the battery terminals at rest the battery should read 12.6 volts if the battery is insufficiently charged. With the engine running the battery voltage should be 14.7 volts. If there was a parasitic draw on the battery the battery would go dead if left over night but if jump started and the alternator was good the alternator would then charge the battery. Alternator problems can be intermittent, some rebuilt alternators are just junk! I would suspect something is causing the alternator not to charge properly perhaps no power getting to the alternator with the ignition key on. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info. There is also a company that independent auto repair shops buy their information from that the same information inexpensively to do it yourselfers. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
COMMENT by on May 16, 2011
Thank you for your help.
ANSWER by on May 17, 2011
you need to replace your plug that plugs into your alternator that should take care of the problem it did for me. I had the same problem, two alternators, two batters and two days latter replace the plug and no more service charging system.
COMMENT by on September 05, 2012
Which plugs are u talking about i have the same problem and im in high school so not having a relible car is killing me i replaced the alternator and the battery i checked the resistance between the conector and the ecm and there was resistance it will still start and run but it dies after about 60 miles. I just replaced the spark plugs and wire and it had been sitting for a while. It also has the traction control and stability control light on, not sure if that is related or not. Please help i want my car back.
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