interferance from factory harness

DEE-83 · 09-19-2018, 06:10 PM

I recently installed a pioneer DEX-P99RS head unit, and I'm getting a lot of interference noise, mainly an alternator whine and static.

I initially thought it was a bad ground on my amps, but I have since found that it's being generated from the harness.

Given the limited space and the fact that I have 4 sets of RCA's running from the head unit, it's somewhat difficult to avoid cross-contact with the harness and RCA's etc.

any ideas on how I can suppress this as the noise is driving me crazy, even when the radio is off and detached the noise is still audible.

ctuna · 09-19-2018, 09:42 PM

Have you tried a minimum configuration.
Then adding things in one at a time.
Does the sound go away with all the rca's disconnected?
If not does it go away when disconnected at the amp end.
Try just the front door speakers to start .
I assume you have amps or dsp's connected to it.

The OEM system was designed for differential inputs .
Not single ended since the rest of your system is not described
kind of hard to even guess what's going on.

DEE-83 · 09-20-2018, 10:35 AM

Thanks Ctuna,

I managed to get rid of the noise, I moved all the RCA's out of the way of the harness, feeling rather stupid lol as I went to the extent of finding a new ground point for my amps.

09-19-2018, 06:10 PM	#1
DEE-83 Private 4 Rep 98 Posts Drives: BMW E93 Join Date: Apr 2016 Location: London iTrader: (2)	interferance from factory harness I recently installed a pioneer DEX-P99RS head unit, and I'm getting a lot of interference noise, mainly an alternator whine and static. I initially thought it was a bad ground on my amps, but I have since found that it's being generated from the harness. Given the limited space and the fact that I have 4 sets of RCA's running from the head unit, it's somewhat difficult to avoid cross-contact with the harness and RCA's etc. any ideas on how I can suppress this as the noise is driving me crazy, even when the radio is off and detached the noise is still audible.
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09-19-2018, 09:42 PM	#2
ctuna Lieutenant General 1911 Rep 13,104 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Have you tried a minimum configuration. Then adding things in one at a time. Does the sound go away with all the rca's disconnected? If not does it go away when disconnected at the amp end. Try just the front door speakers to start . I assume you have amps or dsp's connected to it. The OEM system was designed for differential inputs . Not single ended since the rest of your system is not described kind of hard to even guess what's going on.
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09-20-2018, 10:35 AM	#3
DEE-83 Private 4 Rep 98 Posts Drives: BMW E93 Join Date: Apr 2016 Location: London iTrader: (2)	Thanks Ctuna, I managed to get rid of the noise, I moved all the RCA's out of the way of the harness, feeling rather stupid lol as I went to the extent of finding a new ground point for my amps.
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