Can't fix alternator whine ground loop driving me crazy!

[BEEMDUB]

I have a ground loop and it's driving me freaking crazy...my system consists of a kenwood kvt-512 to a rf p4004.4 and hifonics bxi2607d...I have the front preouts to two splitters into the 400.4 and the rear preout is goin to the bxi2607d...The rear preout used to have a ground loop too but I fixed it by grounding the rcas to the headunit...The front preouts though are driving me crazy It hisses when the car is in acc position and makes a high pitch tone AND hiss when the car is on all the way. It used to be much worse the other day but I put a ground loop isolator on the front rcas and it helped quite a bit but I still hear it Heres all the things I've tried all ready

1. grounding front preout rcas to chassis ---fail

2. grounding front preout rcas to h/u ---fail

3. grounding 400.4 to chassis rather than the battery --- fail

4. grounding h/u to different ground on chassis --- fail

My front and rear rcas are ran through the center of the car and are not ran with ANY power wires at all...what should I try next?

[cuetip]

the way i fixed mine was take the radio apart, and try to plug it all back in, and the whine could also be bc ur kenwood is cheap... i have a poineer avh3200 double din and have had no whine what so ever

[n8ball2013]

why are you using splitters and such? do you only have two preouts?

[BEEMDUB]

the way i fixed mine was take the radio apart, and try to plug it all back in, and the whine could also be bc ur kenwood is cheap... i have a poineer avh3200 double din and have had no whine what so ever

saying I have whine because I don't have the same h/u as you doesn't help at all...thanks tho

why are you using splitters and such? do you only have two preouts?

Yea I only have a front preout and then one rear/sub preout

[n8ball2013]

hes alos comparing the bottom of the line pioneer that is known for ground loop issues with kenwoods bottom of the line like it cost anymore. lol

[Jessica]

Does the hiss go away when you unplug the rca's from the amp? Does it go away with them plugged into the amp but not the head unit?

[Skullz]

I ran my RCA's right next to my 1/0 power wire right down the middle of the car with the wire and rca's taped to each other all the way down with no noise what so ever.

First pull all rca's out from the h/u and amp and let them lay there and have the amp powered and car running to see if it is your amp making the noise and connect everything back up 1 piece at a time till you encounter the noise, it is possible a ground issue it is also possible a colder solder joint inside the h/u or amp but you'll need more equipment to replace what is in there now to make certain.

You could try and ground the rca's as well as moving the ground locations at the amp and h/u if your unable to locate it through doing the other things.

[BFF Larry]

I've had the same problem with my pioneer headunit.

Every thing you tried, I have tried as well. but still failed to fix the noise.

Until I used an inline power noise filter.

I just matched up the fuse rating to the headunit and bought the one closest to the fusing.

I used this one

http://www.sonicelectronix.com/item_38579_P.I.E.-NF-20.html

But here is a cheaper one But does the same exact thing, but looks better.

http://www.sonicelectronix.com/item_26831_Axxess-AX-ANR1000.html

[BEEMDUB]

Does the hiss go away when you unplug the rca's from the amp? Does it go away with them plugged into the amp but not the head unit?

II don't remember exactly I know I tried that though but say if I unplug the rca from the headunit and keep the rcas plugged into the amp can the speakers still produce ground noise?

I ran my RCA's right next to my 1/0 power wire right down the middle of the car with the wire and rca's taped to each other all the way down with no noise what so ever.

First pull all rca's out from the h/u and amp and let them lay there and have the amp powered and car running to see if it is your amp making the noise and connect everything back up 1 piece at a time till you encounter the noise, it is possible a ground issue it is also possible a colder solder joint inside the h/u or amp but you'll need more equipment to replace what is in there now to make certain.

You could try and ground the rca's as well as moving the ground locations at the amp and h/u if your unable to locate it through doing the other things.

Yea I guess I'll have to work my way from amp to headunit, although I've basically already done it I am almost positive its because of the rcas but to me it seems that if grounding the h/u rca leads didn't work that things would point more to the rca's just being bad..even though theyre brand new..but cheap lol

[BEEMDUB]

I've had the same problem with my pioneer headunit.

Every thing you tried, I have tried as well. but still failed to fix the noise.

Until I used an inline power noise filter.

I just matched up the fuse rating to the headunit and bought the one closest to the fusing.

I used this one

http://www.sonicelec...I.E.-NF-20.html

But here is a cheaper one But does the same exact thing, but looks better.

http://www.sonicelec...AX-ANR1000.html

*Edit* lol nvm im slow...this goes like you connect the red to the constant 12v and then ground the black and then connect the blue to the battery constant on the h/u correct?

Edited May 2, 2012 by BEEMDUB