Originally Posted by
WES84
did as suggested and the battery was 12v with the car off, I then started the car and checked it in idle and the voltage was only 9.2 and decreased from there. Does this mean the alternator is bad, or something else is draining the battery?
Batteries tend to sulfidate over time and when that happens they are unable to develop full voltage either charging or discharging. If you have a good charging system and no known drains, I'd put my money on the battery itself. Recommend taking it to a reliable parts store like NAPA or one you trust and have them test it. But the way, new batteries can fail this way too.