Diagnosing A Car Battery That Runs Down Copyright AA1Car You go to start your car and discover the engine won't crank because the battery is dead. Now what? You get somebody to give you a jump start,or you connect the battery to a charger and charge it up until it has enough juice to start your engine.
Your battery is old and will not hold a charge anymore. The battery needs to be replaced. CHECK BATTERY VOLTAGE AND STATE OF CHARGE The first things you want to check are the battery and the output of the charging system (alternator) launch x431 iv. One way to do this is to turn on the headlights. If the headlights come on with normal brightness,the no-crank problem is probably not the battery,but a bad starter relay or solenoid,a poor wiring connection between the relay/solenoid and starter,or a bad starter. If the headlights are dim or do not come on at all,you need to check battery voltage and charging output.
The alternator's output can also be observed as a waveform on a digital storage oscilloscope (DSO) or an alternator tester that measures ripple voltage to detect this kind of problem. Or,just disconnect the alternator overnight and see if the battery stills run down. If the battery drain stops,you have found the problem. Replace the alternator. Battery Related Recalls GM recalled 2013 Chevy Malibu Ecos and 2012 to 2013 Buick LaCrosse and Regal models with eAssist for a charging system fault that can allow the battery to run down and/or cause a fire in the trunk. The"Generator Control Module"in the trunk may malfunction launch x431 pro,causing gradual loss of battery charge and a charging indicator warning light to come on. Continuing to drive the vehicle may cause the engine to stall and not start. In addition,there may be a burning or melting odor,smoke,and possibly a fire in the trunk. The battery drain affects the vehicle's conventional 12-volt battery and not the lithium-ion battery that is part of the hybrid system BMW recalled 2004 to 2010 BMW 5 Series and 6 Series cars for a faulty battery-cable connection in the trunk. A bolt that connects the battery cables in the trunk may come loose,creating increased electric resistance and an overheated cable connection. This may cause the battery to run down due to reduced charging input into the battery as well as electrical malfunctions due to low voltage. In some situations,the cable may overheat resulting in melted insulation,smoke under the trunk mat and a possible fire.
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