the battery probly ran out
The power went out suddenly due to a fault in the electrical system, such as a blown fuse or a problem with the power grid.
There's no such thing as a "power stereo pump", either someone is BSing you or you misheard them for something different.
the car has a radio fuse in the engine fuse box and maybe one in the car but I have never heard of a speaker fuse speaker wires are very low power and there is no need to worry of a power surge as the only travel from the stereo to the speaker and the stereo fuse would blow if too much power went
There is a wire to the stereo that has power all the time ( straight to battery ) so that it retains its memory. This wire is disconnected, broken, or faulted somewhere. If it is an aftermarket stereo it might never have been connected. In the stereo wiring harness there should be one wire that has power with the ignition off, that is the one it will connect to for memory. If there is not one start checking fuses and wire continuity.
You don't.
NO
the ACC wire from the stereo is connected to constant power (+12V)
Power output for a car stereo is pretty standard across the board -- for higher power output you'll need to investigate amplifiers. anonymous@oola.com
The electric energy in a portable stereo is in the batteries. The batteries are what supplies the power to the stereo and in turn makes it work and produce the sound.
A stereo power amplifier is simply a two channel power amplifier. You can runn it in a couple of ways; Stereo, mono or bridged. Stereo has a seperate left and right signal in and sepetate out. Mono is one channel in and both output channels reproducing the one signal in. Bbridged gives you the same as mono BUT it uses both channels as one output.
Try powering the stereo up with jumpers to a power source. If the stereo still won't work with direct power check to see if it might have a anti theft stereo. If no then replace the unit. If it works with jumpers then look for a break in the wire or a bad fuse. Easiest fix in this case would be to run a new wire from the fuse panel, (key on power) to the stereo. These cars are known for stereo problems, my daugher has an 1989 929 and the stereo dies for days and then works if someone turns it off by accident instead of just turning off the volume...
Yes, the speakers (150W) can handle more power than the stereo (140W) can produce. If it were the other way around (stereo more powerful than speakers), that's when you burn out your speakers.