Question about 1999 Volvo S80

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Troubleshooting charging system problem

We recently had a damaged door replaced on our car. They switched out the window motor and other electrical from the old door to the new. Now the battery (which has tested "good") is not being charged. My question is two fold:

first, is this coincidence or could the autobody shop have shorted something out or incorrectly charged the battery, and is there anyway someone could "prove" this?

Second, the alternator seems to be generating enough electricity to run the car, with accessories, on its own, but is not charging the battery. Does this imply that the voltage regulator is the problem, and can it be replaced without replacing the whole alternator? Are there other components (In line fuses, etc.) to the charging system? I can't find a source for wiring diagrams.

Thanks!

Posted by on

  • randyward Dec 27, 2008

    Thanks. Car is a 99 Volvo s80. I'm new to the forum and thought I was on a specific S80 site!
    I did have battery tested (good) and the alternator (it's not charging the battery). I'm just curious if there is anything besides the alternator that could be at fault, or if there are individual components that can be replaced within the alternator, as in some vehicles. I'm new to the Volvo!


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First need to know what type and make of car you have.
most likely not on the problem in the door being any relation to the charging system as this is a seperate system.
and as for the alternator putting out voltage, if you put a volt meter to the lug on the back it should read about 14 volts, however this is not set in stone. you will also have to have the proper amps comins out.
I would take the vehicle to someplace like autozone and have a check done on the battery and charging system as they do this for free. As long as both check then you most likely have a wiring problem from alternator to battery issue.

Posted on Dec 27, 2008

  • Gregory Stobbe
    Gregory Stobbe Dec 27, 2008

    So i assume that as you say the charging system has been tested? does this mean it is ok or dont know as if the vehicle was here in front of me and the alternator was producing the proper amount of voltage AND amps then I would say the battery is showing you false info or as we like to say in the shop world a surface charge this "Surface charge" means the battery is showing 12+ volts nominal but when put under a load it croaks. if this is the case as I asume it is then You have a bad cell or two in the battery. if the battery is more than 1.5 years or 2 old then I say get a new battery and go from there. As if you disconect the battery when the car is running and it stays running then the problem has to be in the battery as the charging system has to be functioning for this to happen if the car dies then it is a charging issue and you need an alternator. I dont know if your specific vehicle has and external voltage regulator or not but as the age of the car is I presume not as they went out around 1992 or so.



    Ps dont forget to rate my answer if you would... Thanks and if i can be further help let me know.

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