2003 Saab 9-3 Q&A

2003 Saab 9-3 Question: Why won't my battery turn over when using accessory power?

If I sit in the car and listen to the radio even for 5 minutes or have the keys in the ignition and door open when loading the car, the battery drains completely and I need to get a jump start. All other times the car starts with no problem. Also, there's a constant humming like something not turning off coming from the cigarette lighter and it's never used. Thanks! -
Answer 1
You have a bad battery. Have it tested. -
Answer 2
Your battery is too old. Test the voltage while you're cranking it and you'll find it less than 10.5 volts which isn't enough juice to start the car. -