How To Check Battery Drain With Test Light. This is a quick rundown of a battery drain test and that link will have a more detailed version of it. Make sure you do not put the red cord into the mA input port on the.
The following steps describe how to use a test light to check for parasitic draws on a car battery. 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. Others do it by clipping an inductive current clamp around a battery cable.
One of the diodes may have shorted out and caused current to drain back to the battery.
With the key out of the ignition let the vehicle sit for 15-45-mins to allow time for all computers to enter sleep mode. Start by taking off the negative battery terminal off of the battery. Simulation of how to perform a battery drain test. 57 How can I use the test light to check the alternator.
