rweddy Posted March 4, 2010 Share Posted March 4, 2010 So this has been going on a while, when I hit the brakes turn on lights I get feedback through the radio. I also hear this when I charge my cell phone, any way to stop this? Link to comment Share on other sites More sharing options...
Durania Posted March 5, 2010 Share Posted March 5, 2010 Usually when I got feedback through the radio it was a telltale sign the alternator was going out. Link to comment Share on other sites More sharing options...
rweddy Posted March 5, 2010 Author Share Posted March 5, 2010 Usually when I got feedback through the radio it was a telltale sign the alternator was going out. Thanks I will get it tested. -R Link to comment Share on other sites More sharing options...
Cougar Posted March 6, 2010 Share Posted March 6, 2010 I assume you mean 'alternator whine' when you say 'feedback' in the radio. It could be due to excessive ripple voltage due to bad diodes in the alternator but also check the grounding to the chassis. Make sure the leads are clean. Link to comment Share on other sites More sharing options...
rweddy Posted March 6, 2010 Author Share Posted March 6, 2010 I assume you mean 'alternator whine' when you say 'feedback' in the radio. It could be due to excessive ripple voltage due to bad diodes in the alternator but also check the grounding to the chassis. Make sure the leads are clean. Its more of static sound then "alternator whine" and only comes on when I have Brakes on or charge my cell phone. Link to comment Share on other sites More sharing options...
Cougar Posted March 6, 2010 Share Posted March 6, 2010 This sounds more like a grounding issue to me than a alternator issue. You may be hearing ignition pulses. Check the antenna ground along with the chassis grounding. Link to comment Share on other sites More sharing options...
rweddy Posted March 7, 2010 Author Share Posted March 7, 2010 This sounds more like a grounding issue to me than a alternator issue. You may be hearing ignition pulses. Check the antenna ground along with the chassis grounding. Great idea, I how many does a Legacy have? I know about the one by the batter, and the two near the windshield. Am I missing any others? -R Link to comment Share on other sites More sharing options...
Fairtax4me Posted March 7, 2010 Share Posted March 7, 2010 There are something like 2 dozen chassis grounds in various places on the car. You're going to want to look at interior grounds. I'd check the two on either side of the transmission tunnel directly under the dashboard. There should also be one or two under the drivers side of the dash. Remove the lower kick panel and look up under the dash. All the wires going to it should be black or brown. Link to comment Share on other sites More sharing options...
Cougar Posted March 7, 2010 Share Posted March 7, 2010 As a test you can also make your own ground lead jumper. Using at least a 14 gauge lead tie one end to the minus side of the battery and the other to a good ground point to see see if that makes any difference. If it does then you have to find the bad ground. Link to comment Share on other sites More sharing options...
nipper Posted March 7, 2010 Share Posted March 7, 2010 Factory or aftermarket radio Link to comment Share on other sites More sharing options...
rweddy Posted March 7, 2010 Author Share Posted March 7, 2010 Factory or aftermarket radio Factory Link to comment Share on other sites More sharing options...
nipper Posted March 7, 2010 Share Posted March 7, 2010 Ok then i vote for checking the Alt, laso how old are your iginiton wires? Link to comment Share on other sites More sharing options...
rweddy Posted March 7, 2010 Author Share Posted March 7, 2010 Ok then i vote for checking the Alt, laso how old are your iginiton wires? About 2 years old, they are oem wires. Link to comment Share on other sites More sharing options...
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