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Message: <blockquote data-quote="UndercoverPunk" data-source="post: 4179191" data-attributes="member: 554673">It's a big *** relay.  If you want to turn your HU on with the car off you can always just rig a switch to feed it 12V whenever you want, it's pretty simple, and will give you the result you are looking for.The Isolator would be a good idea so that you only drain your rear battery, and therefore when you're done, you will always have enough juice to crank the motor.  I don't have one, but I don't sit around listening to my music with the car off.  I've killed my batteries once while I was working on the car, and it too me 4 or 5 days of having the hood up constantly and my stereo at a decent volume.  (Though, my stereo is also quite small at the moment.)</blockquote>

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