Jeep running ok then after standing overnight on the drive it will not start as the battery is drained. Something is draining the battery as it is parked and engine off. The only way to get it going is using jump leads. Already had a new expensive battery fitted but still no good. Unless I can sort the problem quick it's going as unreliability is the last thing I need

SOURCE: something seems to drain the

Hi there,

This response contains troubleshooting procedures designed to locate the cause of an overnight power drain resulting in a dead battery, It assumes the charging system is working.

The first (and easiest) test I run is on the battery.

When you are done using it for the evening, pull the Negative battery cable.

In the morning, re-connect it. If it's dead again, the battery needs replacement.

If it starts, the battery is ok. It's time to look for the power drain.

With the ignition off, ensure the systems that should be off actually are off. For example: does the radio still come on? Wipers? Etc.?

In the same vein, has anything new been installed lately?

The next test is a lot more tedious. You will need a test light, needle nose pliers (to pull fuses) and the proper tools to remove the negative battery terminal (again).

• Ignition off
  
• Remove the cable from the Negative battery terminal
• Hook one end of your test light to the Negative battery post
• Attach the other end to the cable you just removed
• Again, double check connections to recent installations (radio, GPS, etc)
  
• If it lights up very faintly, this is likely the normal drain of the clock. The brighter the light, the bigger the drain.
  
• Find your fuse box
• While keeping an eye on the test light, pull the fuses one by one. Replace the one just pulled before going to the next.
• When the light goes out (or dims), you will have narrowed the the problem to a specific system. Check the legend on the fuse box for the offending fuse.
  

SOURCE: the battery keeps draining and

This may be over-simplified, but to find the battery drain: Remove the positive battery cable from the battery and insert an ammeter in series beween battery and cable. If something is draining the battery, it will show on the ammeter. Remove fuses one-by-one until you see a substantial reduction in the ammeter reading. That will pinpoint the circuit that is draining the battery. Then troubleshoot until you find the faulty component, wiring harness, etc. Remember there will always be a little bit of drain because of ECM, BCM, radio memory and stuff like that.

SOURCE: 2003 BMW X5 fan runs after engine is off, drains battery

if you mean the interior fan
replace fan control resistor driver side footwell in climate housing

SOURCE: my 2000 ford ranger and something draining battery

bad alternator possible or bad battery..even though its new that battery can be bad. I would take a volt meter and with the engine running check the volts of the battery..If the volts are 12 you need to replace alternator, if volts are 14 you need to check the battery. to check the battery hold the volt meter to the battery and have someone start the car..while the starter is cranking battery volts should not drop below 10volts.if they do your battery is bad.

SOURCE: battery keeps going dead. Brand new battery i

something draining the battery .check blower motor sometimes keeps running even when indicating it is off .remove battery terminal and tap against the terminal to see if there any large sparks.if they are . remove fuses one by one as u test till the spark is not there .find out what links are used on that link and disconect one by one when the fuse is on and test if the large spark is still there