Spoiler, would it effect the car if we took out the two fuses to it? We think the spoiler isn't closing every time and causing the battery to drain.

SOURCE: battery on mercedes A140 drains. I drove the car

aftermarket stereo? dome lights? car alarm? Use a multimeter and see what fuse has power draw when car is off.

Mike Butler

• 6674 Answers
• Posted on Jul 03, 2009

SOURCE: Brand new battery is dead with nothing left on. Bad ground?

Remove positive battery terminal from battery & put a 12 volt test light in line between cable & battery post. As long as 12 volt light is illuminated, you have a draw. Start pulling & re-installing fuses, one at a time,until you see it dim or go out. If it goes out, you found your draw. If it dims, slight draw, such as radio memory etc. if all else fails, make sure you know where they all go, then pull them all, and start putting back one at a time. When light comes on bright, you found the circuit causing the draw.

SOURCE: 2000 Navigator - something draining on battery - goes dead

Hellokrissypoo4...Your navigator has what is known as a parasitic battery drain...meaning, something in the vehicles system is not turning off...here is the way i test for this, you will need a digitial multimeter to perform this test...when doing this test make sure that the dome light, under hood light, trunk light, etc. are OFF.

1. Remove the negative side battery cable from the negative battery terminal.
2. Attach an ammeter(this measures amperage) between the negative cable and the negative battery post. wait a few seconds to several minutes for the car to go into sleep mode. i.e. when you make the contact with the test light the cars computer systems "wake up" after a bit of time they will go to "sleep".
3. If the ammeter is reading over 25-50 milliamps, something is using too much battery power.
4. Go to the fuse panel(s) and remove fuses, one at a time. Pull the main fuses (higher amp ratings)last. Be sure to observe the ammeter after pulling each fuse.
5. Watch for the ammeter to drop to acceptable drain. The fuse that reduces the drain is the draw. Consult the owners' manual or service manual to find what circuits are on that fuse.
6. Check each device (circuit) on that fuse. Stop each lamp, heater, etc. to find the drain.
7. Repeat steps 1&2 to test your repair. The ammeter will tell you exact numbers
   
   NOTE:
8. Some after-market alarm systems may make this test too long or loud to be worth the effort. If that's the case, seek professional help.
9. In more and more models made after 2003 disconnecting the battery will reset the PCM requiring the modules to relearn. In certain cases this requires a factory scan tool. It is best to take such cars to either the dealer or a professional in auto electrical systems.
10. Be careful working around the battery in a car
    

Sean Piquet

• 1867 Answers
• Posted on Nov 30, 2009

SOURCE: 87 f250 drained brand new battery

I would first have the alternator checked by an auto electrician to ensure it is working correctly and is providing the correct volume of current. It may be faulty and when driving you will be drawing battery power instead of power from the alternator to run the electrics. This will drain the battery.

Alternators do not last forever and if you are still running the original unit it is likely to be on it's last legs and you will need a replacement unit.

SOURCE: 2006 Toyota Sienna Battery Drain. Side power

the sliding door is probablly draining the battery,, have door checked.. make sure tracks are clean and hinges are not binding