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parasitic load

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Question
My car is not starting and does not make any noises while attempting to start
Hello there. A few problems can cause the vehicle to have a crank no start and they are all electrical. The most likely cause of the vehicle not starting is the battery. After the battery, the starter,...
Question
battery keeps going flat when left overnight
You didn't indicate the age of the battery. If the battery is "new" (less than 2.5 years old) and passes a load test, you should check for parasitic loads. With all car accessories off and key out of the ignition,...
Question
Battery is drained in the morning - 2010 Mercedes-Benz C300
Hello. You have either a faulty battery (a load test on battery can easily determine status of battery), faulty charging system, and/or a substantial phantom load (parasitic power draw) that is discharging the battery while the vehicle is turned off....
Question
Car won't start, battery drain - 1979 Mercedes-Benz 450SL
Hello. The Chilton manual will be able to give you accurate information as to the location of the voltage regulator. This manual can tell you whether your voltage regulator is an internal or external part. It is not recommended that...
Question
Possible electrical issue - 2008 Dodge Avenger
Hello, thanks for writing in. A battery at 45% power is a bad battery. If it takes a charge and then is back to "45%" within hours, the battery is not holding a charge correctly. There is possibly a parasitic...
Question
Battery discharging while stopped, electrical devices were temporarily switched off.
The first thing to do with a draw is to check and make sure nothing is on that can be turned on by a human. Some common sources are interior lights, exterior lights, after market stereo systems or other after...
Question
My vehicle has electrical issues after replacing the wiper motor.
Hi there. There is a parasitic draw that is making your battery go dead. First, charge up the battery to the maximum voltage that it will go to, ie: 12.4 volts to 12.6 volts. Anything under 12.4 volts, then the...
Question
One of the relays is clicking and draining the battery
There could be a parasitic draw involving the relay that is keeping it engaged. Lexus specifications for parasitic draw with the key off is approximately 50 milliamps. Anything over this amount indicates a parasitic draw. You could remove the fuses...
Question
Vehicle won't start...one click.
Hi there. What seems to be happening is there is a parasitic load on the battery when the ignition key is off. What this means is that something is on when it should be off. To check this condition, first...
Question
Battery drained and car key couldn't open car door.
Hi there. The battery is draining for a parasitic load applied to the battery over night. This will drain the battery to needing a charge or needing a replacement. If the alarm was installed and it was for a newer...
Question
Parasitic battery drain
When trying to locate the draw on a battery, I would normally use a process of elimination to locate where the draw(s) is coming from. With everything off, and measuring the draw, I would begin pulling individual fuses or relays....
Question
Car won't unlock electronically, nor mechanically.
Hi there. What seem to have happen is the battery went dead over night. If there was no sign of power, then the battery drained with a parasitic load overnight. The ECM and the fuses are protected to keep water...
Question
Truck running very bad and I have a loss of electrical power.
Hi there. Before you decide to charge or replace the battery, check for a parasitic draw. To do this, remove the negative (-) battery cable from the battery and put a digital volt ohm meter (DVOM) on the battery cable...
Question
Car radio and odometer will not shut off.
Hi there. Find the power source to the radio and see where it is leading within the dash. It is possible that the wires may have a short within each system. This will cause the load on the battery when...
Question
Check gauge light is on and Battery voltage is dropping. The battery is failing to stay fully charged.
Hi there. First the battery will need to be charged to 100% charge of 12.6 volts. Then load test the battery and see if the battery can hold a charge after a load for 30 seconds. If the battery can...
Question
Will not shift and stuck in 1st gear.
Hi there. If the battery keeps going dead overnight, then there is a parasitic load applied to the battery. Charge the battery to a full charge of 12.6 volts. With the battery installed in the car, remove the negative battery...
Question
My car is having repeated problems with the batteries going dead quickly
Have you had your alternator checked? Make sure the charging system is working correctly. Does the vehicle work after you jump start it? If the charging system checks out, the next thing is to check for a parasitic draw. This...
Question
Why does the battery go dead if you forget to use park? 2013 Ford Edge
Hello - newer cars are designed with convenience features that keep certain systems (radio and other infotainment systems) "active" UNLESS the car is in Park. This means there is an on-going battery drain, which will run your battery down after...
Question
Battery draining when it is cold.
To find the source of the parasitic draw, a proper test must be performed on the vehicle. The test includes using a multi-meter to measure system load while removing fuses or relays. If the system load changes dramatically after removing...
Question
My car battery is dying while it's parked. I replaced the battery and in just a week it died while sitting parked overnight.
Hi there. There could be a parasitic load on the battery causing it to drain overnight. To check this symptom perform the following: Remove the negative battery cable (-) Get a digital meter and put one lead on the...

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