Hi everyone in my car i have a jvc stereo and a apa450 clarion amp and when i am driving my stereo vollume goe's up and down but when i am not driving it does't do it i spoke to my mate and he recons it is the amp and i spoke to this guy that puts in stereo's and he recons it is the arial. is there anyone that can help me it's just i don't whant to spend money on a amp and that isn't the problem or buy a arial and that isn't the problem.
Anyone with a sugeston.

 

does this happen with the AM/FM or with the CD player or all the time?

 

It only happens with am and fm radio the cd player is alright.

 

Garyo, is it an older car? Maybe its the noise supration cap on the charging system or the ignition system, might be disconnected or bad. At any rate its a radio signal being generated by the vehicle, good luck

 

Welcome and hello to you!