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sometimes the problem isn't noticeable. it could be a problem in the circuitry itself. how old/new is the amp? is the ground solid? what gauge is the wire? try hooking it up to the battery directly and instead of hooking up the remote wire from the head unit to the amp use a "jumper" (short wire) to connect it from the amp power wire terminal to the amp remote terminal. if its still in protect after that then the amp is bad and needs repair...
Only a select few things can cause protect mode with the battery only connected.
An installation issue. Check the Power, Ground and Remote wires. Make sure non are shorting from one terminal to the other.
It is still overheated and has not had time to cool down from being in thermal protect mode.
The amp itself is touching metal. You always want something non conductive between the amp and where it is mounted, this includes the screws being used to anchor the amp. They should never touch the metal in the car either.
The final thing that can cause an amp to go into protect mode while only hooked to the battery is the amp itself is malfunctioning and or defective. You can try opening the amp and look for any black spots on the circuit board where an electrical component might have smoked up or blown and replace that part.
Turn down the volume or power settings on it since its pulling too much power and shutting off for a few sconds to keep from blowing. Depending on the amp and speakers your using dont bridge the channels. If it won't come out of protect mode then unhook everything and just hook power, ground, and remote and wee what happens. If it comes on again and stays on then amp is blown.
usualy means there is a problem with the speakers, they may be wired wrong, short in the wires or the voice coil in the speakers themselves. best way to trouble shoot is to power the amp with no speakers hooked to it, if it only goes ito protect with the speakers hooked to it, the the problem is with the speakers, not the amp.
hi. your amp has an internal power supply fault. problem lies in the remote turn on regulator circuit or with the pulse width modulating circuit.this fault definitely needs to be in technicians hands. cheers