This video explains the followings
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How to find an electric short in a car or truck that drains the battery overnight
How to do a parasitic current draw test with a multimeter in a modern car
How to find an electrical short to ground
How to diagnose a short using multimeter
How automotive relays and fuses work
Best way to perform a parasitic current draw test in a modern car
How to use a short or open circuit finder (cable tracker) to find a short
How to find a parasitic battery drain

This test will only tell you how to find a short circuit, If you have a open circuit in your wiring, This method wouldn't work.

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