Car has a low whining noise when pushing on on gas after install aftermarket radio

Hi, I replaced a aftermarket radio with another aftermarket radio. The original has no whining noise when pushing gas but the new one does. Im not sure what could be causing this since the old one worked fine. Could it be the wiring harness? I looked around and it states the power cable maybe too close to the speaker wires but not sure which cables they are talking about. If its the ones on the harness you cant do much about the distance between them. If its from the harness to the speakers I dont see how the old one works and the new ones dont. Can someone help?
Thomas NSystems Analyst - Windows System AdministratorAsked:
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Thomas NSystems Analyst - Windows System AdministratorAuthor Commented:
I've requested that this question be deleted for the following reason:

Didnt work. I think its a bad radio since the old one works fine.Going to be returning it.
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Mark BullockQA Engineer IIICommented:
Is your radio grounded to the car properly?
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Thomas NSystems Analyst - Windows System AdministratorAuthor Commented:
It has a black ground wire that is connected to the black ground on the harness coming from the stereo. Should this not be enough or should i ground it to some metal on my car instead?
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Mark BullockQA Engineer IIICommented:
I think you should ground it to the car.
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Natty GregIn Theory (IT)Commented:
ground it to the car and install a suppressor capacitor, some stereo are super sensitive and picks up the noise from the engine
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dbruntonCommented:
Well, don't ground the wire.  It is already grounding through the harness.

Find a screw somewhere on the radio and ground that to the body of car.  Look for a mounting screw on the radio preferably and run a wire from that to a earth point somewhere in the car or a piece of body metal somewhere you can attach the other end of the wire too.

Check your aerial connection and make sure the connection is good.  Break the connection and reconnect if necessary and move it away from any wires.
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Thomas NSystems Analyst - Windows System AdministratorAuthor Commented:
So its grounded twice?
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dbruntonCommented:
Yep.  

You don't want to disconnect the ground that is in the harness.  That might actually be working OK.  Just make an additional ground.
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Thomas NSystems Analyst - Windows System AdministratorAuthor Commented:
OK I will give it a shot and come back with results.
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Michael-BestCommented:
"low whining noise when pushing on on gas"

This leads me to suggest fitting a suppressor to the alternator (generator) also fitting a suppressor to the coil ... but do read the rest of my comment.

Was the radio installed by a professional installer?
If so go back to them and put the responsibility and cost on them.

If you want to troubleshoot it yourself then there can be many causes.
If the radio was a cheap non brand product then it may be that it receives interference regardless of what ever you do...
Modern engine components do not give out interference unless faulty.
If your car is not so new, then look at suppressor spark plug caps, suppressor to the distributor, suppressor to the coil, suppressor to the alternator (generator), grounding wires for the bonnet and radio chassis and also replacing the aerial lead with an interference shielded lead.  

You can get these suppressors, etc. at any automotive accessory shop.

For further reading see howacarworks.com "Identifying and suppressing radio interference"
Link:
http://www.howacarworks.com/accessories/identifying-and-suppressing-radio-interference
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