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Headunit Power Problems!

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I installed my new headunit the other day with a sub and amp and they are working really good now, however when I turn off my engine and remove the key, each time I start up the car again all my settings have gone back to default, ie: bass, treble etc? Has this happened to anyone else? Could it be something to do with the amp bypass cable? Any help or pointers would be great as always!!

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Try swapping the red and yellow cables around first.

Is it a cheap Japanese stereo off ebay?

My old cheap one used to do the same, you had to turn on the stereo leave it a second, then start the car.

It doesnt seem to like the instant on-off-on.

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