How to Test Your Car Battery For A Parasitic Battery

by:AGM lithium battery     2020-07-22
If you wake up in the morning locate your car battery dead, your car might be suffering from a parasitic battery leak. When your car battery goes dead overnight, there are typically 2 reasons: the battery can be quite old and needs to be replaced, or you left something in your car on, like a manner. If neither of the previous 2 options are true, then something else is drawing power from the car's battery. Car professionals refer to this a parasitic draw, therefore can cause the same dead battery as leaving the car's headlights on overnight.
What exactly is parasitic draw?, you're probably asking now. Autos sold in the draw some power from their batteries, even when effectively shut off, because some car accessories (clocks, radios remote door openers, alarms) always need an influence source. The normal power used any vehicle is off is called the parasitic draw. Provide you . a very low draw, so which does NOT run the car's battery down. NOTE: Some car owners install additional car accessories, such as shortwave radios, and type in things like invertors & portable wine refrigerators. Then, they operate these lengthy time without the engine running, which can drain a car's batteries so low it's engine won't start. An electrical short in automobile or a malfunctioning accessory can draw a much higher than normal load, causing a drained electric battery. For example, simply leaving utilizing a door open all night, with within lights on, could drain the battery dead.
The first element of accessing the regarding your dead battery is to test for a major short. To do this, remove the positive and negative cables from the batteries, and put an Ohm-meter across all of them. If it's reading is in order to 0 Ohms the actual battery has a primary short. You MUST trace the nature of the short before you is able to these tests.
Tools You'll Need for This Job:
Safety goggles & gloves
A digital multimeter or ammeter
capable of reading up to 10 amps DC for $15-$50.
A fuse puller or pliers.
All tools necessary to access battery and fuse panel(s).
The Owners' Manual showing the car's electrical circuits.
Steps To Locate & Repair A Parasitic Drain
A parasitic drain is when an utility device uses battery power, even although the car is closed with the ignition removed. So, quite important, when performing the steps below, to make sure ALL LOADS ARE TURNED OFF: dome lights, under hood light, trunk light, empty cigarette lighter, keys removed, stop smoking .. Once all power sources are off, the 1st thing you have to do is PUT On top of your SAFETY GOGGLES & GLOVES.
Carefully remove the negative side battery cable from the negative battery critical. Disconnect the thick positive (Red) cable that goes down to the basic. Connect the black wire to the com input, and the red wire to your 10A or 20A input, on the multimeter. Your battery must have inexpensive charge (not be completely dead) to do this test to position. IE. If your dome light operates, the battery has enough charge in it. If the battery does Dont you have enough charge left, put a charger on the batteries overnight. For this test to work, the meter must read at least 2-5 amps . NOTE: DO NOT connect the red wire to the mA input on the multimeter, as folks damage the meter.
Using the multimeter's instructions, set the dial on it to measure Built in amplifiers. Make sure your meter is ready to the 10 amp DC multitude. Some meters have a special connector for the red probe when you are reading . If the meter has one jack for high amps and one for low amps, make sure the meter end on the probe is a right connector. Connect the multimeter with the negative cable along with the negative battery entry. Connect the negative probe to your red cable because of this still connected towards the vehicle. Make sure this cable together probe do not touch ground. Wait for that car to go into sleep mode (a few seconds to a few minutes). NOTE: beneficial make contact using the ammeter, the cars computer systems 'wake up. Within a few minutes, they systems go back to 'sleep again.
Do this second step by holding the meter probes within respective contact points (there should be no shock from only 12 volts). You can use probes with alligator clips to hold them in setting. Connect the positive probe towards the battery - either battery is fine, since they are connected together by the black, negative wires. (Polarity doesn't matter on digital meters because effectively autosensing.) If the ammeter reads above 25-50 milliamps, something in the car is using great deal battery power, ensuing an a battery pressure. A severe current draw (above 10 amps) will either pop a fuse in your meter or destroy it. So, you've to TEST FOR This quick. Otherwise, your meter should now be reading the current drain on your onslaught. If the vehicle has a burglar system or remote locks, the power draw may certainly be around 2-3 amps for a few minutes, even big event doors are all closed. This is normal, but wait at least 20 min after the last door is closed before you take a reading. If all things are normal, the meter will read less than 35 milliamps (.035 amps). If the current drain is compared to that, find out what is draining your batteries.
Find the car's fuse panel (under the dashboard). Remove each fuse, piecemeal. The purpose associated with the is to see the ammeter after pulling each one. Begin by pulling fuses up to the load goes back. If doing this does NOT reduce the battery draw, look with the wire that is corroded or frayed. NOTE: Main fuses have higher amp ratings, so pull those very. Repeat this step for all relays in the fuse panel too. If relay contacts to be able to release, this would also result within a battery drain.
Watch the ammeter for a drop to an acceptable drain. The fuse that reduces the drain considerably is the battery draw. Consult the car's owners' or service manual to locate what circuits are powered by that fuse.
Check each circuit connected to that fuse individually. Ie. Turn off each light, heater, etc. until locate the drain. NOTE: If there are a few shorts in the vehicle, it could take awhile to do these tests.
Once you find and repair vehicle battery's parasitic drain, repeat steps 1&2 to test the repair. The ammeter will read the exact numbers.
Final Notes & Warnings For All DIY Car Enthusiasts
Check associated with car's cigarette lighter and power sockets for coins that might fall in and short circuits. After-market alarm systems may make testing lengthy time and High. In that case, you must seek specialized help to fix the car's parasitic battery drain. Associated with models later than 2003, disconnecting the battery resets the PCM, which requires the modules to relearn. Sometimes, this takes a factory scan tool. Take these cars to a dealer or auto electrical systems industrial engineer.
To participate in a parasitic draw test in a dual battery system, while you have an electric winch, rewire the truck temporarily as two separate circuits, in order to the winch and someone to the wagon. Each must then be investigated independently for shorts. Only use caution whenever using any cars electrical application. You must BE Positive the changes made for the electrical system of any vehicle are within it's boundaries. Opera. All fuses are classes . the right places, together with their correct amperage, when adding or changing anything electrical.
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