Lately my stereo system is acting funny... At random times the bass in the sound system seems to fade, and no matter how much I dial it up it does nothing.. I still get volume, but no bass.
It happens at completely random moments...could be 'blasting' the music and it would be fine... and when I turn it down the bass randomly dials down on its own, or the opposite.
Turning it on and off does not help. The original owner did switch everything to a upgraded amp, then put the factory deck and amp back in before he sold it... All the wiring looks ok from inside the trunk.

Any ideas?

 

This is totally a guess..
Maybe its a ground issue at the Amp/Radio...
Via a loose connection/corrosion?

I'm sure someone else will have a better solution
Than I have suggested...
But I hope this helps Jen.

I had a loose ground... With similar thing your experiencing.

 

Mine did the same thing a couple months after I bought my Monte. I pulled the connectors from the amp, sprayed them with some electronic cleaner and it hasn't done it again since. My best guess is the connector had oxidized.

 

check your ground. when my old car did that I pulled the ground off the chassis and it was rusted to badly