My amplifier has started shutting down over a certain volume, very low, maybe 15-20%.

The unit is under the passenger seat and on inspection the ground contact was very corroded.

I cleaned it up and reconnected, and the problem persists.

The thing is there is extra corrosion on that area, notably the seat mount. There is also corrosion on the amplifier casing, where I’d screwed it to the floor.

Anyone identify those exposed car body threads that I’d used as a ground point?

Is the ground corrosion and the seat mount and case corrosion linked?

Is the issue due to the amplifier install, or in spite of it?

I think the amplifier ground is now not causing my shut down issue, I’ve run a good connection straight the the battery terminal and the symptoms are the same. Looking inside the amplifier there isnt anything obvious. the corrosion is limited to outside. But of course it shouldn’t be there.

Any thoughts on this little pickle? I’m assuming I've created some kind of galvanic corrosion circuit where the ground point is being eaten away to feed some other build up elsewhere. But I’m not clever enough to know what that actually means.

Thanks.

 

Any thoughts?