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I'm going to suggest you check the POS and NEG cables (fuse's side and ground side as well). Before you check/clean them, start with the NEG (or the siren will remind you that the NEG should have been taken off first). IF you have any oxidation/corrosion on any point, clean or maybe replace depending on what is found. This should be done before you try tracking down anything else, so you have clean power to the car. After that, might have to do the parasitic drain (.pdf listed here in the forum, as suggested by another member @ the battery standing voltage). Good luck!


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