Grounding Factory HU

[ephyouckay 10+ year member]

im having engine noise coming from the tweeters and when i unplug the RCA from the amp i goes away.

I already checked my main ground and it is good. It is connected to chassis and it is sanded and bolted in tight as possible. From the distro block to the amp it is a 3.5 ft wire. At first i had it at 5 ft but i reduced it down to 3.5 and it didnt help at all.

I checked for pinched wires and i also made sure all my crimps were covered with electrical tape. I tried a different pair of RCA that are connected to the rear speaker wires in the trunk and it actually became worse.

I am using two LOC's. One tapped intot eh factory radio harness and one in the trunk tapped into the speaker wires. i tried grounding the LOC in the trunk (rears) and it didnt do anything. The front LOC has not yet been grounded but since it didnt do any improvements in the rears im pretty sure it wont help much in the front.

My power and RCA are ran on opposite sides.

Im not sure what else i can check except change my HU ground. im guessing i would have to tap into the radio harness and reground the ground wire. I was wondering instead of clipping the wire can i splice it? Would the HU just choose the best ground route? can i just use remote turn on wire as the ground wire? i have some extra remote turn on so im planning on using that.

if its not the ground on HU the last thing i can think of is the LOC itself. im using two hiltron LOC purchased from million buy.

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[johnecon2001 5,000+ posts]

Well think about this a little. When you unplug the RCA's the whine goes away.. which would mean it's something before the RCA's. Reground the HU and the LOC.

 

[ephyouckay 10+ year member]

ok, that fixed the problem i regrounded the HU... grounding the LOC didnt do anything for me.

*NEW PROBLEM 1

Now i just have hiss... no engine whine... its just like a static noise type thing but it can only be heard on low volume or in between songs.

it doesnt increase with RPM etc so its not engine noise and there is not whine.

NEW PROBLEM 2

I also tried plugging in the RCA that i have in the rear that is plugged into an LOC in the trunk and the LOC is tapped into the rear speaker wires in the trunk. When i plugged it in i got the engine whine back again. so when i plug the RCA in that is hooked up to an LOC that is tapped into the front speaker wires on the radio harness i dont have engine wine (only have some hiss) and when i plug in the rear RCA wires i have engine noise and hiss.

What is causing this to happen? both are knukonceptz RCA .

these are for the rears

http://knukonceptz.com/productMaster.cfm?category=Klarity%20RCA%20Kables

these are for the fronts

http://knukonceptz.com/productMaster.cfm?category=Karma%20RCA%20Kables

could the RCA cause the wine? Will i get distortion if i hook a sub up to the rear RCA wires? since subs only put out low frequencies wouldnt it not effect the subs then?

 

[ephyouckay 10+ year member]

anyone??