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That should be fine, when the car is running it puts out 14.4 volts so the tuner has to have some built in regulator.
Im still trying to figure out how to have roadrunner save a list with this tuner, and also to return to HD menu and save the station it was on. Right now any time I leave the HD menu and come back it is at 87.5 and I have to retune it.
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