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<blockquote data-quote="PTG" data-source="post: 7216899" data-attributes="member: 630422"><p>Alternator whine, and some other types of noise, can, and often do, require some tedious and step by step troubleshooting.&nbsp; Without physically examining your setup, I will try to give you some basic things to check.&nbsp; First, keep in mind that the metal chassis of the car is one big ground.&nbsp; If done properly, there is no need to run grounding wires all over the place.&nbsp; Check your ground connections making sure any and all grounds, have good connection to the chassis.&nbsp; Scrape away any paint and primer, use a bolt, star washer, and nut when at all possible.&nbsp; Make sure your source cables (RCA) are run away from your power connections.&nbsp; If they must come close at some point, make sure they just intersect and then head away from each other again.&nbsp; (In other words, not parallel to each other).&nbsp; Get rid of the ground loop isolator.&nbsp; In most cases those things create more problems than they solve.&nbsp; After these few things, if you still have whine, get back to us.&nbsp; One thing also kind of stands out, you mention that the alternator makes a noise like a supercharger.&nbsp; I&#039;m no expert in that field, but that&#039;s certainly not normal.&nbsp; An alternator that has bad brushes, etc. can amplify some of the issues you are trying to get rid of.&nbsp; You may consider taking it to a service center and have it tested.&nbsp; Best of luck.</p></blockquote><p></p>

[QUOTE="PTG, post: 7216899, member: 630422"] Alternator whine, and some other types of noise, can, and often do, require some tedious and step by step troubleshooting. Without physically examining your setup, I will try to give you some basic things to check. First, keep in mind that the metal chassis of the car is one big ground. If done properly, there is no need to run grounding wires all over the place. Check your ground connections making sure any and all grounds, have good connection to the chassis. Scrape away any paint and primer, use a bolt, star washer, and nut when at all possible. Make sure your source cables (RCA) are run away from your power connections. If they must come close at some point, make sure they just intersect and then head away from each other again. (In other words, not parallel to each other). Get rid of the ground loop isolator. In most cases those things create more problems than they solve. After these few things, if you still have whine, get back to us. One thing also kind of stands out, you mention that the alternator makes a noise like a supercharger. I'm no expert in that field, but that's certainly not normal. An alternator that has bad brushes, etc. can amplify some of the issues you are trying to get rid of. You may consider taking it to a service center and have it tested. Best of luck. [/QUOTE]

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