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Message: <blockquote data-quote="SkwurlyFab" data-source="post: 8475270" data-attributes="member: 567256">I've been having a lot of trouble with a phantom power draw on my 04 Chevy 2500HD. I've got two XS Power D3400 batteries under the hood wired in parallel with a Mechman E-series 250a alternator powering them. My system consists of a Kenwood DNX-8120 HU feeding an Orion HCCA-D5000 sub amp, and a JL 300/4 amp for my mids. All 1/0 wiring with big 3 done.I also have a Directed Smart Start alarm installed with the cell phone connection service, but it isn't activated right now (not sure if that makes a difference).I will charge my batteries all day up to 13.1 volts, and by the next morning my volt meter is reading at 11.9v. Well below the 12.6v minimum charge. I'm quick to charge them back up, but I'm worried about damage over time and obviously this is a huge pain in the *** since I'm always worried my truck is gong to die.I have no idea how to locate what is drawing all the power out of the batteries as the truck is parked. I have a multi meter I can use to test the system, but how do I figure out what component is actually draining the power?At one point I noticed that my sub amp was staying on, since the red logo was lit up even when the truck was off. This seems to have gone away and I have been keeping an eye on it, but that is concerning.I also noticed that my dome light stays faintly lit when the truck is off, locked, with alarm activated. I replaced the bulb with an LED so I don't think it can drain enough power to take two XS batts down to 11.9v, but if that is staying on, maybe something else in the system is too.Any and all help would be appreciated! I searched through the forums for answers but couldn't find anything definitive so I had to post up.</blockquote>

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