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I have an 2001 Mitsubishi diamante LS. I bought an aftermarket radio which i also got the suggested harness however when ever i hook it up it plays a pitching sound thru the radio the in creases when i accelerate. Checked the ground there is not one on the harness so i make one behind the dash and it test good. Still makes noise i have no idea what else to do. Btw i have a stock a amp in my car that runs the car speakers.

Posted by Anonymous on

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  • Cars & Trucks Master
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You need to install a power line input filter to filter out the electrical whining noise from the Alternator. See a local car stereo shop.

Posted on Jul 15, 2017

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Posted on Jan 02, 2017

luckyluke78
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SOURCE: 1989 Chevy Truck , Stock Radio , Whining noise

Sounds like you have a capacitor problem.It could be a number of issues , but i suggest you check the alternator one first.

If you unplug the power cable to the back of the alternator and the whining goes away then replace the capacitor(usually only one bolt/screw)and you should be OK.

If not I sometimes have dissconnected the + wire from the HT coil when the car is running and the same applies,and if this works replace the capacitor or fit one if there isn't.

If none of this helps fit one to the + wires of your radio.

Please leave fair comment if I have helped you.

Thank you

Posted on Sep 01, 2009

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