volume goes up and down automaticaly

[tofst4uvette]

I have a 97 tahoe 4 door with the factory system and the volume goes up and down on its own. I replaced the head unit with another one and the same thing happens. any ideas where to look next?

 

[TahoeGoBoom]

is it the factory head unit? or did you replace it with an aftermarket one?
the factory head unit have scv or avol, or w/e they call it now. it basically turns up your volume at higher speeds. there should be an adjustment on the radio itself.

 

[tofst4uvette]

its the stock unit, and I know about the volume control you are talking about but this totaly dig=ffrwent it goes from barely hearing it to blasting then way down again while sitting in the driveway

 

[rc2atvs]

this happended to one of ours. it was the rear cargo speaker. 1 small thread of the wire going into the cone was hitting the basket of the speaker and making the radio go crazy. i guarantee if you check all of yours one is grounding out to say?

 

[tofst4uvette]

Thanks for the info I will check it out this weekend. Hopefully that is it