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Ground Loop?
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<blockquote data-quote="ultimate157" data-source="post: 4183631" data-attributes="member: 566638"><p>The reason the Pioneers develop the alternator whine is the HU has a "Picofuse" on the PCB for the ground on the RCA's. If the rca's are played with when the system has power, it is very easy to pop this fuse and wipe out the proper ground on the RCA. Grounding the shielding to the case is indeed a ghetto fix, but its a free one.</p><p></p><p>I'm not sure whether or not the RCA's ground is totally disconnected when the fuse blows, but if it is then an isolator wouldn't work since there isn't a complete circuit.</p><p></p><p></p><p>Turn your HU volume up to 55 or 60 ... Pioneers don't clip until 62/62.</p></blockquote><p></p>
[QUOTE="ultimate157, post: 4183631, member: 566638"] The reason the Pioneers develop the alternator whine is the HU has a "Picofuse" on the PCB for the ground on the RCA's. If the rca's are played with when the system has power, it is very easy to pop this fuse and wipe out the proper ground on the RCA. Grounding the shielding to the case is indeed a ghetto fix, but its a free one. I'm not sure whether or not the RCA's ground is totally disconnected when the fuse blows, but if it is then an isolator wouldn't work since there isn't a complete circuit. Turn your HU volume up to 55 or 60 ... Pioneers don't clip until 62/62. [/QUOTE]
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