loss of power

[loser_fish 10+ year member]

I have a JBL 300.1 amp and it is powered through my AUX power output and my problem is that whenever I apply my brakes and start coming to a stop, my amp cuts out and my subwoofer looses power.

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[natem33 10+ year member]

My theories: I'm not real familiar with the wiring of the AUX power that you are using, but you may have a wire hooked up wrong or a short with the brake light wire. When you apply your brakes a stop lamp switch is activated. If there is a wire cross or short within your break wiring then you may lose power whenever that switch is activated. Try applying light pressure to your breaks and watch for power loss. You may even want to have a friend apply the breaks while you check for voltage at the amplifier with a multimeter. Another possibility is that your alternator is on the verge of dying and cannot supply the power to both your break lamps and your amplifier so your stereo suffers. Another possibility is that there is a loose power or ground wire somewhere which shifts any time you attempt to stop your vehicle. Another possibility is that there just isn't enough power flow for your amp. When you say AUX power, the only thing I can think of is your AUX RCA out puts. Is your amp wired directly from the battery? If not then do so.