noise through speakers

[ddotmueller13]

I had 2 12inch subs with amp in my truck. 2005 silverado extended cab. But I was running the factory head unit. Everything worked fine. I replaced the head unit tonight with a JVC KW-R920BTS. The install went fine but now as soon as I turn the radio on it has a static noise, even with the volume off. The antenna is hooked up fine. I ran the ground trough the wire harness. The amp ground is good. Is there a setting I need to change? I know the shop that did the install had to add something to make it work with the amp and subs. Is that something I am going to need to take out??? Lots of questions thanks

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[porkcereal]

Sounds like a bad ground loop on the rcas. Look up ground loop fix. If the noise changes when you accelerate then you have power wire ran too close to rcas.

 

[ddotmueller13]

I have had this set up installed in my truck since 2005. There has never been any noise until The aftermarket headunit. I am not sure what the guy put on the truck to make it work with the factory unit. What would a reputable shop do to make an amp and subs work with factory unit? It also has a knob for bass adjust hooked up.

 

[porkcereal]

They would add a line output converter (loc) which with an aftermarket head unit you wouldn't need. They should have given that back to you if they pulled it out like they should have.

 

[The Camry]

The nicer hardware you get, generally the more sensitive it is too interference.

1. when you replace headunits, or really do anything electrical on a car. you should ALWAYS disconnect the battery. When you wire something up like say a common without wiring the ground first. You run the risk of essentially powering the headunit without a ground, it grounds to itself and bad things happen to the electronics. I doubt this happened to you. Just an FYI

2. its possible your Rcas are too close to a power cable. If you truly think that is the cause. Run a different pair of rcas completely outside of all panels and whatnot. From headunit, over seats and such. directly to amp. See if that helps. IF it does. Its most likely just power wires and rcas too **** close.

3. This is most likely your problem. Its a ground loop. just change out the ground on the head unit to something that isnt stock. You shouldnt wire audio hardware to anything with stock ground places. Too many electronics in the car can cause ground loops. Just find a better ground.

 

[Louisiana_CRX 5,000+ posts]

Grounds are bad about inducing noise...connection can vibrate loose in a vehicle even after years of good service...

 

[ddotmueller13]

I did the install on the JVC headunit, but did not take the LOC out, would that cause the issue? The ground that was on the new JVC, I just hooked into the ground of the wire harness adapter, so it is just ran wherever the factory was, or where the last shop put it if they moved it. Should I piggy back into that one and ground it somewhere else or cut it and run somehwere else. I have done installs before but never over top of someone elses work.

 

[The Camry]

Run headunit ground to new ground.

scratch paint, test if its a good ground, screw in. done.

However im not sure why you have a loc. your headunit has rcas outputs yes? so why are you running high level to loc?

 

[ddotmueller13]

I had the LOC because i was running factory head unit for 10 years with amp and subs. I just didn't take it out. Do you think I should take it out? I will try the ground first tomorrow. Thanks for the help.

 

[ddotmueller13]

I spliced into the ground and ran it over to the door striker just to se if that was it and there was no change in noise.

 

[disturbed471985 5,000+ posts]

toss the loc and run rca via HU and get back to us.