How to determine the source of parasitic draw?
To determine the source of Parasitic Draw (Dark Current), start by checking for aftermarket accessories. If any aftermarket accessories are present, remove the power to these accessories, and then retest. Finally, follow normal diagnostic procedures to identify source of draw.
How big of a DMM is needed for parasitic draw?
If there is an electrical short in the vehicle or a malfunctioning accessory it could draw more than its normal load causing a large drain on the battery. In order to check for parasitic draw, a Digital Multi-Meter (DMM) that can handle a minimum of one milliamp and up to 10 amps is needed to perform a parasitic draw test. 1.
How is parasitic draw measured in a car?
Measuring Parasitic Draw All vehicles draw some power from their batteries when the car is shut off. In order to check for parasitic draw, a Digital Multi-Meter (DMM) that can handle a minimum of one milliamp and up to 10 amps is needed to perform a parasitic draw test.
How many milliamps does a parasitic load run?
It is usually a very small draw so the battery doesn’t become drained. Parasitic loads can run 20 to 120 milliamps. If there is an electrical short in the vehicle or a malfunctioning accessory it could draw more than its normal load causing a large drain on the battery.
When to look for a parasitic power draw?
Your battery could be near the end of its service life and it should be recycled and replaced with a new one. If the battery test shows that it is still good, then it’s time to start looking at a parasitic power draw. While you’re under the hood (or at Advance Auto Parts), test the alternator.
If there is an electrical short in the vehicle or a malfunctioning accessory it could draw more than its normal load causing a large drain on the battery. In order to check for parasitic draw, a Digital Multi-Meter (DMM) that can handle a minimum of one milliamp and up to 10 amps is needed to perform a parasitic draw test. 1.
It is usually a very small draw so the battery doesn’t become drained. Parasitic loads can run 20 to 120 milliamps. If there is an electrical short in the vehicle or a malfunctioning accessory it could draw more than its normal load causing a large drain on the battery.
Measuring Parasitic Draw All vehicles draw some power from their batteries when the car is shut off. In order to check for parasitic draw, a Digital Multi-Meter (DMM) that can handle a minimum of one milliamp and up to 10 amps is needed to perform a parasitic draw test.