I used one like #3 20 years ago to test for draw. At that time some devices needed up to 20 minutes with power to properly shut down modules. With that type of device you could set up an ammeter in series using the device and after 20 minutes or so safely disconnect the battery to check for draw. With all the new electronics on cars today I wouldn't even want try to figure out what would be a normal draw. It used to be
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I used one like #3 20 years ago to test for draw. At that time some devices needed up to 20 minutes with power to properly shut down modules. With that type of device you could set up an ammeter in series using the device and after 20 minutes or so safely disconnect the battery to check for draw. With all the new electronics on cars today I wouldn't even want try to figure out what would be a normal draw. It used to be
When you cut off your battery, all life on Earth stops in its tracks. 😮😅