Car dies after a week

[JackalUO]

I recently had my battery replaced three months ago and my O2 sensor about 5 weeks ago. The problem is that the car dies after a week of operation. Doesn't crank doesn't turn over. Battery has been tested as well as the terminals and they check out fine. Any ideas?

 

[DeNoZZo]

do you have any accessories that would stay on when you shut the car off?
The only other thing that i can think of that might cause a problem like that would be a underdrive pully or maybe some type of alternator problem.

 

[JackalUO]

I've had a new stereo installed along with a 10 inch sub and amp but they have been working for over 2 years with no problems.

 

[DeNoZZo]

I've had a new stereo installed along with a 10 inch sub and amp but they have been working for over 2 years with no problems.

It has to be something within the battery recharging system.

 

[JackalUO]

Voltage regulator?

 

[JackalUO]

Anyone know what could be causing this? Would it be a bad fuse?

 

[turboAWDfanatic]

Get your alternator tested for free at Autozone. Check for voltage drain coming from your stereo equipment when the car is turned off (do a search, the procedure for this is somewhere on the forums).

 

[gekido666_1]

are u Running a cap. for your Sub.

 

[TOONAH]

This is how you test for a drain on your battery when the ignition is off. Get a cheap multimeter. Put it in the highest DC Current range. Disconnect the Battery positive wire.
Put the black meter lead on the positive battery terminal and the red lead on the the battery positive cable. Be sure that none of your leads can short to chassis. If you read more than about 200- 500 milliamps (ECM draw) then you have a partial short to ground.
It is nearly always a shorted diode in the alternator rectifier diode pack. This can also be
proved because the Alternator output will not be 13.6VDC no load. Or just take the alternato to Autozone for a free test.

 

[turboAWDfanatic]

This is how you test for a drain on your battery when the ignition is off. Get a cheap multimeter. Put it in the highest DC Current range. Disconnect the Battery positive wire.
Put the black meter lead on the positive battery terminal and the red lead on the the battery positive cable. Be sure that none of your leads can short to chassis. If you read more than about 200- 500 milliamps (ECM draw) then you have a partial short to ground.

Yeah, THAT'S the one I was talking about! Sorry, was too lazy to think about it when I posted!!!

 

[JackalUO]

Multimeter plus pulling fuses to check where the draw is coming from = Aftermarket amp connected to sub is why my battery kept draining. New amp and she is good to go. Thanks for the help guys