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Been using he y splitter with extension for months now including having 3 devices hard wired to be on 24/7. I think the one device in the OBD split is also on 24/7. Everything works and battery hasn't dropped below 11V after 2 days of the car being off. Not sure how low it could get before it causes an issue so that's a question, but everything works I love it! So in love with everything about this car and everything I've added couldn't be happier! But y splits mainly depend on the devices because sometimes one becomes the master and one the slave.
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