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Parastic Draw
by 1986chevyman on Feb 08 2019, 9:53 PMElite Tech
There are different methods of locating a parasitic draw. The most common method is took hook your multimeter in a series with the negative battery terminal with a fused connector. Set your mutimeter to amps and see what the current draw is. It may take 30 minutes to an hour for some modules to go to sleep. If the draw is out of specs, fuses are removed one at a time till the draw is found.
Another method is to use an thermal imaging camera to see which fuse the current is going thru. The only thing is that usually the vehicle has to sit overnight to cool all the way down, so a slight temperature difference from an unwanted current draw can be detected.
Another method is to use an Amp Hound which detect current flow thru a fuse by measuring voltage drop across a fuse.
With all the methods, after the offending fuse is found, one must find how many circuits the fuse has (looking at a wiring diagram) and unplug each device one at a time till the parasitic draw is found. Or with a thermal imaging camera one can point the camera at each device the fuse supplies and look for a heat signature.
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