Put an ammeter on your chassis battery with everything turned off. The only draw would be in milliamps for maybe the memory in the radio. If you have more than that lift the lead on one suspected component at a time to see if the draw stops. If your case the BIM and or the alternator. If neither one of them are the culprit then it's a major guessing match. I'd move on to the major fuses and relays in the fuse box next.
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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