We have gone through 3 batteries in the past couple of months. The mechanic said it has been bad cells in the batteries. When it sits for more than 3-4 days it won't start and I have to jump it.
I have checked all of the interior lights
and nothing stays on. I don't have any
clue what else to do.
You will have to do battery draw test or have it done.
To test the electrical system for unwanted loads draining power, shut everything in the car off. Leave the vehicle just like you would overnight. make sure all the lights and accessories are off. Remove the negative post wire and check current draw with all electrical loads off using a test light. (I made a test light from an old tail lamp bulb.) The dull glow in the light filament indicates a current drain problem.
This is not my example, Credit goes to this link: http://www.w8ji.com/battery_and_charging_system.htm
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