i just love people who stick up for the corporations who are making money hand over fist at our expense.
med insurance have been making record cash by giving worse care,
what would people like to see 4.00 or more gas prices again so the oil companies can set some more records, they defended...
aftermarket amps will likely have speaker level or rca cables to get the music signal to the factory amp, this is what you need to find out.
so look at the back of the current deck and the factory amp, it should be easy enough to see what the amp gets it's signal from.
your aftermarket deck...
make sure the battery cables are connected well that would be my first guess but the alternator could have gone out at the same time.
i would recommend getting a multimeter and learning how to use it to diagnose problems in the future.
an alternator should cost between 60.00 to 120.00 just try...