At this point maybe both. The battery light comes on when the alternator is not supplying enough power to operate the vehicle, and the battery is being forced to provide the difference. This problem, if not serviced, will quickly drain the battery. Replacement of the alternator is most likely needed. Be advised that alternator manufacturer/re-builder will not warrant an alternator that is installed on a car with a dead battery. So have you battery checked out; if it is good get it charged first. If it's bad replace it along with the alternator and you should have no problems.
SOURCE: 2003 saturn vue service light on with wrench how
Open the hood. You will notice there is a large black box on the right-hand side directly behind the battery. This black box is the fuse box. Pull the top of the fuse box off. There are two clips on either side; once you pop one side, the other comes off very easily. In the top left-hand side of the fuse box where all the fuses sit, you will see a large orange/red block. Below this block is a button that says "reset." Press this button for 5 seconds. Turn the car on and wait for a minute. If the light does not go on, turn off the car and set the key to ACC on the key ring. Push the reset button again, holding it for a total of 15 seconds. Turn the key to off, take out the key, return the key and start the car again. Allow the car to run for 2 full minutes. It is taking the system a few minutes to register that this button has been pressed.
SOURCE: 2005 Saturn Vue - Starting Problems
make sure to check your fuses and ground wires first. when you are set on which part is bad do a quick check of everything else before you jump into it.
SOURCE: 2002 Saturn Vue V6 Loss of Power
Yup. The throttle body connectors have a history of failing on these cars. Replace the throttle body and the wire connectors that go to it, and you're back in business. Not terribly difficult and you can get the parts from any dealer. Saturn actually has a bulletin out on this problem but they won't cover it unless you're under warranty - no recall for this.
SOURCE: possible bad alternator?
I went through three alternators before we found a good one for our saturn sl2. Now she has been good for two years. All I did was go back to where we bought it from, they hooked up the alternator to a machine and gave us a new one when it read that it was faulty.
SOURCE: Service Engine light on Green line 2007 Saturn Vue
take the ground line of the battery and press the brake for a few minutes and if the life is still on have the vehicle scann and clear code and have the emission components for the vehicle check
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