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<blockquote data-quote="PianoPlayer07" data-source="post: 7762752" data-attributes="member: 642119">Just an update:Had a chance this morning to take the hu out of the front console and wired it up outside the vehicle and totally eliminated any factory harness warning. The hu was sitting on a table outside and I ran the power wire, turn off wire, and ground directly to the amp feeding my door speakers. I then used a short set of RCA cables hooked directly to that amp. What this also did was again, eliminate everything stock and allow everything in the chain to come to one power source and one ground source that I know is reliable.The results were that the high pitched tone that had been coming through wasn&#039;t there anymore. However, the alternator sound was still coming through like it had been. I also tried wrapping unshielded wire around the outside of the RCA outputs again in an attempt to ground those but no difference was made.My next move I think will be to hook the hu, one amp, and an external speaker up to another car&#039;s battery and fire up the engine. If the alternator noise is still there then I&#039;ll know it&#039;s for sure the hu. If it&#039;s not, then it will at least rule out equipment. I&#039;m also going to try just soldering the pico fuse since that will for sure eliminate that issue. I have a suspicion that is the main culprit at this point.I just want to re-illiterate once again that I have went through the chain and narrowed the problem down to the hu. I&#039;ve hooked an iPod up and everything and the system operates fine using that. I&#039;ve already tried most of the simple stuff, so please be sure to take a thorough look at my post before suggesting something I&#039;ve already tried several times.Thanks again.</blockquote>

[QUOTE="PianoPlayer07, post: 7762752, member: 642119"] Just an update: Had a chance this morning to take the hu out of the front console and wired it up outside the vehicle and totally eliminated any factory harness warning. The hu was sitting on a table outside and I ran the power wire, turn off wire, and ground directly to the amp feeding my door speakers. I then used a short set of RCA cables hooked directly to that amp. What this also did was again, eliminate everything stock and allow everything in the chain to come to one power source and one ground source that I know is reliable. The results were that the high pitched tone that had been coming through wasn't there anymore. However, the alternator sound was still coming through like it had been. I also tried wrapping unshielded wire around the outside of the RCA outputs again in an attempt to ground those but no difference was made. My next move I think will be to hook the hu, one amp, and an external speaker up to another car's battery and fire up the engine. If the alternator noise is still there then I'll know it's for sure the hu. If it's not, then it will at least rule out equipment. I'm also going to try just soldering the pico fuse since that will for sure eliminate that issue. I have a suspicion that is the main culprit at this point. I just want to re-illiterate once again that I have went through the chain and narrowed the problem down to the hu. I've hooked an iPod up and everything and the system operates fine using that. I've already tried most of the simple stuff, so please be sure to take a thorough look at my post before suggesting something I've already tried several times. Thanks again. [/QUOTE]

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