Engine whine thru audio system...help

[Jeff5347]

OK so I'll try to make this short and sweet. Previous to yesterday I had installed in the truck a 12 inch sub powered by a 300 watt amp, pioneer coaxials in the rear door and pioneer components in the front door. Dash speakers stock and no amp powering the doors. At that point I had no engine/alt whine ( at least not audible). So yesterday i installed a precision power i1000.4 that powered my all my door speakers and wired in in by using the 2 metra connectors and 9 wire to get the signal to the amp then back to the door speakers. Like this thread

http://www.gm-trucks.com/forums/topic/178355-hozers-2014-sierra-audio-upgrades/page-1

After driving today, this is when I noticed the whine. I checked my power cables and they are clean and on the drivers side while my 9 wire is down my pass side. I checked my amp grounds and they are bolted to where the seats bolt down ...I checked w a test light and had a good ground. Also checked resistance thru my grounds with my volt meter and had less than 2 ohms of resistance...from what I've read under 3 ohms is desirable so I'm good. My other thought is at the connections behind the radio thru the metra connectors. I connected both the factory power and ground of the radio thru the metra connectors but wonder for the radio ground if I should find a chassis ground vs the stock ground where ever it may go. Any advice or thoughts

 

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[EMCguy]

Did you remove paint at the connection point of grounds? Are grounds going to same bolt or different?

 

 

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[Jeff5347]

The grounds for the amps are at the same point and yes I removed paint from that connection point. Oh another thing I forgot to mention is my promote turn on wire goes from a switched ignition point at the fuse panel to under the back seat where the amps are. Would a remote turn on wire cause this?

 

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[EMCguy]

Probably not, but electrical issues can defy logic sometimes. I chased one for almost 2 years before finally reconfiguring the same vehicle. New ground location solved it....what size power wire are you running to amps and to grounds?

 

 

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[Silver ice 6.2]

2 things.. rca wires need to be away from the power wire... or loose ground. Or bad ground..

[Jeff5347]

I'm not running RCA's. The 9 wire is speaker level inputs. I agree on the ground. For some reason I'm thinking connecting the radio ground to where the amp is....

 

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