How do you get rid of engine noise in speakers?
Hooking up the stereos ground wire to the new ground location is up to you. Every situation is different so you may need a crimp end or some other modifications inside the dash cavity to get the ground wire hooked up. Just changing the stereos ground location will often resolve the engine noise problem.
How do you get rid of radio whine?
Why does alternator whine?
Your car can also make a whining sound when the voltage regulator is sending signals to the alternator to charge more than is necessary. If you hear any type of whining or grinding sound that’s a good indication that your alternator needs to be checked.