My battery died but the alternator charging system was fine leading me to believe there was a parasitic leak in one of my car's subsystems. After you received this product, it came with no instructions and no maps showing where to find instructions online. I visited her main website and she was there, but the instructions were a little vague, especially for those who are new to troubleshooting electrical systems with a multimeter. It would be much better if it came with detailed instructions on how to set it up, but once you understand how to use it, this product does what it's supposed to. Eventually the problem was discovered after this tester showed me which system was draining the battery, when I pulled the fuse the reading immediately dropped to zero.
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