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With an amp meter installed between the battery's terminal and the battery cable remove fuses one at a time until the load goes to 0. You can use a test light too: The light should not light much, if at all if you put it between B+ and the battery cable. But if there is a draw it will glow. Just lift the fuse contacts until the light goes out.
-Jason
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket 
Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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