Battery Draw Test
Also indicated as 300ma ma x 1000 a.
Battery draw test. The first three tests require the use of a digital multimeter. Is something draining your cars battery. This is the best way i have found to perform a current draw test. And you dont need to have much experience in car repair to apply any of these tests.
If not setup properly you can get erroneous results. Use a multimeter and these step by step instructions to perform voltage drop tests to isolate the circuit that is draining your car. Put the test light between the post and the ground wire. Once youve determined the high draw circuit there still may be a half dozen loads each individually innocuous but collectively sucking the lifeblood out of your battery.
Dont pay a mechanic. The voltage drop battery drain test. If you dont have one you can buy a useful multimeter for around 20 dollars. Now that we have verified that the battery is experiencing a parasitic draw we can move to exploring the different reasons and parts that can be pulling on your cars battery.
Use the fuse pull method to find the draw. Electric devices like timed and dimming dome lights can stay awake and produce excessive drain on the battery for up to 10 minutes. The bad alternator diode test. If the light illuminates you have a draw.
When a car has battery drain proper testing is vital to finding the problem. Some of newer vehicles can be a real pain to diagnose parasitic draw test with a multimeter due to all the added electrical circuits computers and control modules. Some of these systems are interlinked exacerbating the problem. Performing a draw test without the proper setup can be a big waste of time.
The purpose of this test is to evaluate the level of parasitic current draw from the battery during a vehicles shutdown phase and sleep periods. The amperage battery drain test. When the light goes out you found the draw. In my example my multimeter low setting is 03 amps.
Parasite current draw tests can be a nightmare. You have electric mirrors heated memory seats gps trackers and a slew of gadgets. In the past my go to method was to just put a meter on the battery and measure the correct draw wait for 30 45 minutes and recheck.
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