alright guys

i'm getting some alternator whining and I doubt it has anything to do with the speakers because they are stock Bose connected to the stock Bose amps. All I did was swap the headunit and plugged the speaker wires into the RCA preamps. The RCA cables are Monster Cables that I cut in half so I can use the 4 ends for each speaker. I just spliced the + and - wires for each speaker to an RCA and plugged them in. These aren't cheapy RCA cables! The splice was done w/ solder, electrical taped the solder spot, and twisted the wires together for a neat/organized install.

Okay, before I finalize that I would really need the bose adapter, I'd like some help on the grounding part.

I made a quick rough diagram so you guys have an idea of what I am talking about...

What I did was I spliced all 3 ground wires together (chassis ground, AMP ground, and headunit ground) together and then grounded that set on the bolt that's connected to a metal bracket holding the computer. I verified that bolt with a voltmeter too and it was a good ground point.



Here's the question... are the speakers and amps already grounded behind the door panels? If so, then that means I would only have to ground the headunit... and I've read that if I ground all of them together at 1 spot it would cause interference.

What other preventive measures can I take to prevent this whining? Remember, I havent' touched anything else except that wiring harness up till the back of the headunit. The problem lies there somewhere! Please, lemme know what you think.

 

You keep indicating some chassis ground someplace. What the heck is it a ground for? Where is your amp? And why the hell are you using RCA cable for speaker wire? Big waste of money on that. Does your amp have speaker level inputs or do you need a converter?

Answer the above questions so that we have a better description of your system. Keep all grounds as short as possible. Never ground to any place that vehicle factory items are grounded.

 

On the wiring harness I bought, it has a ground wire that's labeled "CHASSIS GROUND".

My amps are the Bose amps, nothin else.

I am using the RCA cables so I avoid buying the Bose adapter... Don insisted that I didn't need it so I followed his advice.


I'm wondering if the stock bose amps/speakers are grounded already behind the door panels where they are located...

 

The headunit harness should have wires labeled to connect to all the wires coming out of the headunit. And it should match up perfectly with the factory connector for the factory headunit. I don't have any experience with bose headunits but you were probably supposed to use RCA cables from the pre-amp outputs on the headunit.

The bose amps are grounded. Otherwise they would not play anything. They would be "dead" quiet.

 

hmm okay, thanks for your help. I'll test all those grounds and see what happens.

Not all the wires matched up from the back of the headunit to the harness.. but I read a couple posts saying that they're already grounded so I didn't want to add anything extra to it.