new problem battery dying while car is off.

Technical Topics specific to the 4 dr. Sedan body - NOT where you post pics/build specs of your car.
 Reply

By 8lackeg8
- Sat Nov 03, 2012 2:31 am #319102 how do i figure if its charging? but the battery drains when the car is off tho?

By JohnRM
- Sat Nov 03, 2012 2:48 pm #319125 If your car needs it, get it jumped so that you can start the car. Then get a voltmeter and test your battery by posting it on the positive and negative. If you see it fluxing around the ~12v area, then you're good. But if not, turn the car off. Check your battery again and watch the volt numbers from your battery. If you see the numbers decrease, something in your car is draining it (could be an electrical problem) or the battery can't hold the charge anymore (usually means a new battery)
User avatar

By bigJOE671
- Sat Nov 03, 2012 3:39 pm #319127 Start you car...I'm sure you can get it jump started.

Now with the engine running

what volts are showing with no accesories on?

what volts are showing with all accesories on (AC/Heater on high, headlights on, radio on, rear defroster on, and domelight on) ?

Your can test the voltages at the battery or other places.

^This test will show if your alternator is working correctly

Now before you do that test check your grounding points in your engine bay. If they are corroded, clean them. This will cause voltage drop and will not charge the battery correctly

After you test the alternator if you want to find out if something is draining your battery...you need to do a parastic draw test.
http://www.youtube.com/watch?v=PYUoXApI89Q
http://www.youtube.com/watch?v=KF1gijj03_0
 Reply
Return to Chassis - Sedan