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<blockquote data-quote="Alc5M" data-source="post: 7689354" data-attributes="member: 618783">Someone help me out herei got an 03 tahoe with stock bose system, non premiumdeh-p4000ub HU and GM-os04 harnessI installed the headunit and as soon as i turned the key on i instantly got a feedback sound thru the speakers, i turn the truck on and i get alt whine that changes with the rpmsduring the 10 minute RAP period with the key off that leaves the radio playing i get no feedback whatsoeverfirst thing i did was turn down the potentiometer in the harness but to get rid of the whine i needed to turn it almost all the way down, and then you can barely hear anything with the volume maxedso i turned that back to original pos, and changed the ground to the metal framing of the dash and still no helpso what else could it be, i havent tried the rca&#039;s, maybe the HU is bad on the 2 sets of speaker RCA&#039;s? is there any easy way to check thatany help would be appreciated, thanks</blockquote>

[QUOTE="Alc5M, post: 7689354, member: 618783"] Someone help me out here i got an 03 tahoe with stock bose system, non premium deh-p4000ub HU and GM-os04 harness I installed the headunit and as soon as i turned the key on i instantly got a feedback sound thru the speakers, i turn the truck on and i get alt whine that changes with the rpms during the 10 minute RAP period with the key off that leaves the radio playing i get no feedback whatsoever first thing i did was turn down the potentiometer in the harness but to get rid of the whine i needed to turn it almost all the way down, and then you can barely hear anything with the volume maxed so i turned that back to original pos, and changed the ground to the metal framing of the dash and still no help so what else could it be, i havent tried the rca's, maybe the HU is bad on the 2 sets of speaker RCA's? is there any easy way to check that any help would be appreciated, thanks [/QUOTE]

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