New system going in - Page 3 - Chevy Impala SS Forum
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post #21 of 32 (permalink) Old 08-07-2019, 06:35 PM Thread Starter
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I removed the deck and redid the wiring with a new harness and also added a ground wire from the de I chassis to the car chassis and also tied that ground into the ground wire of the harness and I STILL get a whine.

A local stereo shop suggested soldering a ground wire to each of the RCA cables and making a connection to a chassis ground saying that sometimes the connection itself isnt good enough. I cant really see how I could accomplish that very easily though.

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post #22 of 32 (permalink) Old 08-08-2019, 08:21 AM
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I removed the deck and redid the wiring with a new harness and also added a ground wire from the de I chassis to the car chassis and also tied that ground into the ground wire of the harness and I STILL get a whine.

A local stereo shop suggested soldering a ground wire to each of the RCA cables and making a connection to a chassis ground saying that sometimes the connection itself isnt good enough. I cant really see how I could accomplish that very easily though.
What's the condition of the RCA Cables? I recently re-did my system, and replaced the RCA cables and any noise I had disappeared.
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post #23 of 32 (permalink) Old 08-08-2019, 10:50 AM
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Thanks, that's a big help in diagnosing this thing. This morning I removed the ground wire at the frame and cleaned very good down to bare metal and reattached the ground wire with no change in the whine. I also read that the ground for the amp should be separate from the ground for the capacitor but my ground wire leaves the frame then goes to a junction block and continues over to the capacitor so I'm about to separate those grounds to eliminate that as being an issue as well.

I've been interested in your build (well also sorry on the SO front). From what I used to do with this stuff 40 years back I especially noted discussion above surrounding ground loop. Beware my intel on this is mostly sourced outta my ass, but I had a big prob with whine that turned out to be components grounded separately - PLUS the blessing of an added periodic anoying 'pop' I answered the ground loop whine issue by joining all the grounds - so the part I highlighted jumped out at me.



For reference, the pop was from huge impedance mismatch between components purchased together from a supposed 'expert' stereo seller. Took 3 months tracking that down, and dealer tried 200 ways to get out of correcting his FU by providing me compatible replacements. And he lost. hahaha I learned something here that I'll remember when I go after putting in a Nexus 7 = avoid RCA wherever possible - thanks.

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post #24 of 32 (permalink) Old 08-08-2019, 12:06 PM Thread Starter
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ALL components are NEW and quality stuff (Rockford Fosgate).

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post #25 of 32 (permalink) Old 08-09-2019, 12:26 AM
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Is it still whining

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post #26 of 32 (permalink) Old 08-10-2019, 02:30 AM Thread Starter
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Is it still whining
Yes it is.

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post #27 of 32 (permalink) Old 08-10-2019, 11:54 PM
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I'm sorry to hear you still have that whining. I'm at a lost now, this is where advice no longer works and I have to see it in person to figure out what's going on.

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post #28 of 32 (permalink) Old 08-11-2019, 12:09 AM
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Let's try this again, I have only seen a problem like this once or twice.

1. You isolated the amp and subs no whining

2. Check the rcas from behind the deck using the female connectors and 3.5 mm rca does it whines?(no= pointing to the deck as the source of the whining, Yes= you need to reroute your RCAs or buy a premium set of RCAs)

3. You Re wired the headunit with supplied harness and you still have whining?

4. Let's try this, do you still have the old alpine headunit? If so swap them out since they use the same harness and see if the whining comes back. No= bad headunit, Yes= harness is located near a large power source .

5. As far as grounding your rcas I've only seen that when someone mistakenly touched the power to the rca and blew the ground tracing located on the headunit motherboard. But other than that without personally being able to touch it , I'm lost

Sorry Sir

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post #29 of 32 (permalink) Old 08-11-2019, 06:05 PM Thread Starter
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Quote:
Originally Posted by Frasierraheen View Post
Let's try this again, I have only seen a problem like this once or twice.

1. You isolated the amp and subs no whining
YES

2. Check the rcas from behind the deck using the female connectors and 3.5 mm rca does it whines?(no= pointing to the deck as the source of the whining, Yes= you need to reroute your RCAs or buy a premium set of RCAs)
YES and NO whine

3. You Re wired the headunit with supplied harness and you still have whining?
YES

4. Let's try this, do you still have the old alpine headunit? If so swap them out since they use the same harness and see if the whining comes back. No= bad headunit, Yes= harness is located near a large power source .
Good idea, I'll give it a shot this week sometime.

5. As far as grounding your rcas I've only seen that when someone mistakenly touched the power to the rca and blew the ground tracing located on the headunit motherboard. But other than that without personally being able to touch it , I'm lost

Sorry Sir
Answers below each numbered question.

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post #30 of 32 (permalink) Old 08-22-2019, 10:10 PM Thread Starter
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I may have found the source of my stereo whine. I checked resistance from negative battery cable (at the battery) to the amp ground at my passenger side frame rail and only have .3 ohms resistance. I then checked the resistance from the negative battery cable (at the battery) to the alternator case and I have 3.3 ohms resistance. Tomorrow I'm going to build a quality 4ga cable to bolt from the back of alternator directly to the negative battery post and see if the cures the issue. I further need to double check resistance from my negative battery cable to the engine and to the chassis and fender and if any connections show anything more than .5 ohms I'll address that as well.

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