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Re: stereo loses power when vehicle is in motion.
Look for a loose wire or connection! Obviously something is getting disturbed by the bumps and motion of the vehicle.
You would have to get access to the wiring that is associated with the radio, and try moving, pushing, and pulling on the wires and connectors to make some kind of disturbance. They when you make the fault, you work your way around to zero in on the exact location.
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If you've confirmed that it's actually losing power (a CD will start over when the display and sound come back) instead of just the display cutting out, then you should first check your fuse panel in the vehicle, and make sure the fuse that provides power to your radio is seated firmly and securely. Try jiggling it if you can and see if the radio cuts out then. If it seems fine, take the radio out of the dash but leave it connected. While it's powered on and playing, jiggle the connector that's plugged into the back of it. If it's still fine, do the same thing with the wiring harness that's connected to the factory wiring. At one of those connection points (fuse panel, connector at rear of radio, or connection to the factory wiring in dash) you may have a loose connection.
If you cannot repeat the radio failure by doing this, you likely have an internal problem, such as a failing power supply, or it's overheating and shutting itself off.
look in glove box for radio code,it may be in the owners manual. after you lose power to stereo,it shuts itself down for anti-theft. you'll need that code to program into your radio before it will work again. hope this helps and thank you for choosing fixya.com
I'd say go back to the guy who installed and get him to do it right. He's either left some wires exposed so they are intermittently touching, or has an open connection to one of the speakers. The amp will shut down to protect itself. He may also not have wired the speakers correctly. Some systems don't work unless both hot and ground wires run directly to each speaker. Some installers run only a hot line and use the car body for ground. At higher powers this can cause amp shutdown or keep it from working at all. In any case the installation wasn't done correctly.
check out your wiring under your steering column covers. there has always been an issue with those wires getting hot and shorting out or burning up all together. headlights are affected the most but it is sparatic as to what it affects in that harness.
i have alpine stereo's in all my vehicles and i have had this problem. if you run a 10-14 gauge constant wire from the stereo directly to the battery the stereo will not shut down in protection mode. it is not the cd it is the stereo going into protection mode because of lack of current not voltage. i hope this helps after i did this i could play the stereo as loud as it can go until my battery died