I noticed it the other day after I came outside to get something from my car. Some of these can be dealt with at home, and others will probably require a visit to your mechanic, but there’s no way to know for sure until you roll up your sleeves and dig in. A forum community dedicated to Jeep Wrangler owners and enthusiasts.

You'll be able to meet friends, as well as get help repairing and upgrading your Jeep. When everything is working correctly, you can walk away from a vehicle like this, and everything will shut off on a timer. If any corrosion is present between your battery terminals and cable connectors, it will interfere with the ability of the starter motor to draw current from the battery and the ability of the charging system to top the battery off. ​Parasitic drains can be difficult to find, but they are fully capable of killing batteries dead.

If your alternator belt is loose, you may be able to tighten it. He is also a systems administrator for an IT firm in Texas serving small businesses. If it had happened when I'd parked for the night rather than during a brief stop while shopping, it could have easily killed the battery. I’ll also mention in passing that many vehicles are equipped with battery saver modules that are capable of timing-out the interior lights and other accessories after the ignition is turned off. He also ghostwrites articles for numerous major trade publications. Around 200,000 my '08 Patriot (sister to the Compass) started running down the battery every few hours. None of these gauges would work with the alternator field connected. The battery negative-to-engine cable displayed nearly zero milliamperes (mA) current flow while the battery negative-to-body ground wire displayed exactly 200 mA. The dealer got back to me and they said it looks like the radio has been staying on resulting in the battery drain! That means if anything is left on after the engine is shut off, the battery will almost certainly die. You would hear it blowing if it was actually energized. While measuring the voltage drop across each of the interior “junction block” mini-fuses, I located a voltage drop across mini-fuse #23. Removing fuse #7 eliminated the 180 mA drain. It’s important to note, however, that there is a difference between a simple test and an in-depth diagnostic that actually gets to the root of the problem. As previously mentioned, the only part of the charging system that you can really check or test without special equipment is the belt.

Haven't had your exact issues but these things are becoming well known for electrical issues so just document everything well and get your dealer to work with you. “Doing the math” will help define the type of battery drain we’re dealing with. Imo this explains why factory installed tires always waste away faster. That already done, we elected to replace the PCM, which solved the Mysterious Instrument Cluster Disconnect problem.

If you are not aware of the problem, the parasitic load can drain power off your battery overnight.

If the battery didn’t pass a conductance test, a known-good battery was to be substituted to provide a stable system voltage.

So if it seems like the battery is dying with the engine running, there’s probably an issue with your charging system. However, there are actually several reasons that a car’s electrical system might cut out when driving, and even more reasons for an engine to simply die. I mean dead to the point the doors won't even unlock. If your car battery keeps draining, the first things to check are your lights. Charging system problems can also cause a battery to die repeatedly, although you will usually notice some level of drivability problems as well. If you look inside the cells and see that the electrolyte level has dropped below the tops of the lead plates, that’s a problem. But when the temps went to sub zero, it would barely click the solenoid the next morning. 1) The BCM must be powered at all times so when it senses an “open” signal from the door and hatch sensor switches, it will activate the interior lights.

Only issue I have had is when getting in and out of the truck, my knee hits the light switch and turns it on. “Old School” testing methods are counter-productive to accurately measuring, estimating, and locating battery drains on modern vehicles. Only issue I have had is when getting in and out of the truck, my knee hits the light switch and turns it on. It laughs at the cold - seems to actually start better and crank faster in cold than hot. I was worried my battery was going to die if it stayed on.

Photo 4: As discussed, locating the source of a parasitic drain can be very time-consuming. Even small drains, like the memory function in your car radio, may kill a very weak battery.

This tool puts a load on the battery that simulates the draw of a starter motor and allows you to see both the loaded and unloaded battery voltage. 2. Going a step further, disconnecting the BCM eliminated the battery drain. I have an appointment to take it to the dealer AGAIN for this reoccurring problem and I was just curious if it was a common problem.

If the belt seems loose, it may actually prevent the alternator from generating enough power to charge the battery in addition to running everything else. If you test the battery, and it checks out fine, and the connections are tight and clean, then the weather shouldn’t cause it to die repeatedly. I've had two incidents where the car radio did not turn off after I got out of the car and set the alarm. а 1.500.000р Полная ЖЕСТЬ... We install the cheapest HEAVY DUTY Control Arms on our TJ! Once into the lower dash, they discovered a badly burned aftermarket wiring harness connected to the B+ wire on the brake light switch. If you come back half an hour or an hour later, and things like the headlights are still on, that's probably why your battery is dying. My client shop quickly recognized that the high-amp sound system installed in the Jeep was likely causing the high-amperage battery drain and, with the current owner’s permission, removed the system. We only found 10mA draw on the battery when the car was turned off, that doesn't seem like enough to drain a battery overnight, is something coming on periodically to drain the battery? While I readily acknowledged that possibility, I wanted to confirm that by checking the mechanical instrument cluster wiring schematic. The problem with using a test light is that it can be very difficult to tell how much of a drain is present just from the brightness of the light. Join thousands of other Jeep fans as we tackle Wrangler problems and more. The Jeep was then sold to a second party, who didn’t realize the complexities involved with solving this battery drain problem. As a general statement, if the battery is completely drained, the battery-saver system isn’t working or the electrical system has been modified. The shop then determined that a low-amperage battery drain remained, which they couldn’t locate.

Wow funny thing is my radio is now staying on after my dealer told me they "updated it".

As a general rule, a “parasitic drain” of less than 30 milliamps (mA) is normal for most vehicles 15 years old and newer. Even if you've already ruled out obvious things like the headlights and dome light, there may still be a drain in your system.

Thankfully, the burned condition was limited to wires dropping outside the main harness. Even lights I believe will turn off eventually if you happen to leave them on. Is that right??

I'm glad I got it fixed -- I got a couple more trouble-free years out of it.

Photo 1: An improperly installed aftermarket sound system nearly ruined the electrical system this 2000 Jeep Grand Cherokee.

If you don't see anything obvious, like headlights or a dome light left on, then the next thing to check is the battery itself. A scope/graphing multimeter can be used for the same purpose.

2004 Jeep Liberty -- battery draining over a two-three day period.

the best way to look at this problem is with a12 volt test light then remove the ground cable from the battery turn every thing off inside the car close all doors and remove keys then connect testlight to battery cable and touch the test light point probe to the negitive battery post if test light lights up for more than three seconds and stays on you have draw on the system. Make sure to check for any interior lights when it's dark outside.

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