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No power my car stereo - sony- looses all power at 60mph + nothing works. when i slow under 40 for at least 5 minutes, it comes back on. Car toys was clueless.

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Re: no power

Hi, help please. I have an MTX 40004 amp when i put the out put signal wires into my sub amp I get a pop (static sound) this happens every time I change the radio station or press any button on the radio or make any operation action on my radio even turning the ignition key off. This only happens when the signal wires is plug into the sub amp.
thanks a lot if you can help me much appreciated.

Posted on Oct 18, 2008

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Re: no power

It sounds like your charging system may be causing the problem. The voltage may be too high or the stereo may be too sensitive to high voltage. You need to connect a voltmeter to your system to make sure it's not charging over 14.5v. A normal charging system wii charge at 13.5-13.8v.


Have someone connect a digital multimeter to the B+ and ground wires of the head unit. Have a passenger monitor the voltage while driving. If the head unit cuts out at the same voltage each time and the voltage isn't excessive, the head unit needs to be repaired. If the voltage goes up above ~14.5v, the charging system needs to be checked.

Posted on Oct 17, 2007

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