I have a snake in my car

[fasfocus00 5,000+ posts]

okay so after a couple of weeks of just dealing with it, I am now trying to get rid of the constant hiss in my car. thinking that it's a ground issue, i put the DMM under the hood, in the trunk, and behind the dash. under the hood is 13.98, trunk is 13.98, dash is 13.96. after this thinking that the .02 difference is doing anything I locate a better ground putting me at 13.98, hiss is still there. check over my gain setting on my AC 6XS and on all my amp, gains are turned to the lowest possible setting on both; hiss is still there. thinking it might be RCAs, swapped RCAs even ran them through center of car, hiss still there. maybe it's the power and signal wires crossing somewhere, nope not crossed. grounded RCAs, made hiss louder. put ground loop isolator inline and hiss is still there. I'm getting desperate, I'm thinking it's some sort of alternator ripple and considering put a capacitor in line. any other ideas of possible fixes? BTW it's a constant hiss and does not change with engine speed or volume.

Click to read more...

 

[skitzafit 10+ year member]

http://www.caraudio.com/forum/general-discussion/209314-snake-my-car.html

 

[hatedonmostly 5,000+ posts]

Mine does the same, but ONLY when listening through my USB flash drive...how about yours?

 

[fasfocus00 5,000+ posts]

Mine does the same, but ONLY when listening through my USB flash drive...how about yours?

does it on all sources; AUX, ipod via usb, fm radio, XM radio.

 

[whitedragon551 5,000+ posts]

What HU do you have?

 

[fasfocus00 5,000+ posts]

What HU do you have?

Sony XAV-60 right now, I tried my Panasonic and still had hiss.

 

[whitedragon551 5,000+ posts]

Did you check for bare wires in the harness or fuses in both fuse boxes that may be burnt out?

 

[fasfocus00 5,000+ posts]

Did you check for bare wires in the harness or fuses in both fuse boxes that may be burnt out?

yup checked all earlier today both visual and through my DMM. didn't use harness for factory plug, have a relay for switched power and constant from a distribution block (fused obviously).

 

[hatedonmostly 5,000+ posts]

I think the next step it to try to hook up and iPod directly to the amp through the RCA inputs, or swap to a different amp. Sounds like you've narrowed it down to the amp...

 

[fasfocus00 5,000+ posts]

I think the next step it to try to hook up and iPod directly to the amp through the RCA inputs, or swap to a different amp. Sounds like you've narrowed it down to the amp...

I've put my amps in another car and it had no hiss.

 

[infamous_e46 5,000+ posts]

better than having one in your butt right>>>???

 

[whitedragon551 5,000+ posts]

I've put my amps in another car and it had no hiss.

So then its not the HU and its not the amp. Its somewhere in the wiring between the speakers and the HU.

 

[hatedonmostly 5,000+ posts]

Are your speaker wires next to power? I've heard that could cause issues, but it isn't in my car.

Some cars are just noisy, from what I hear. I don't know.

 

[fasfocus00 5,000+ posts]

Are your speaker wires next to power? I've heard that could cause issues, but it isn't in my car.
Some cars are just noisy, from what I hear. I don't know.

i have ran speaker wire to all speaker directly from amp. I have speaker and 0 gauge power wire ran on driver side. I have remote wire, RCAs, and speaker wire running on passenger side. I will have to try to unplug each speaker to see if it gets rid of it. I have not tried this. I have not heard of power wire causing a hiss through speaker wire.

 

[hatedonmostly 5,000+ posts]

i have ran speaker wire to all speaker directly from amp. I have speaker and 0 gauge power wire ran on driver side. I have remote wire, RCAs, and speaker wire running on passenger side. I will have to try to unplug each speaker to see if it gets rid of it. I have not tried this. I have not heard of power wire causing a hiss through speaker wire.

Worth a try I suppose. How's your ground on the amp? Are all amps grounded to the same point? Might want to try grounding the amps/rear batteries to the front battery as well, by just running a wire outside of the car.