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<blockquote data-quote="pellis" data-source="post: 3639337" data-attributes="member: 560163">ok around 3 wks ago, i went out to my car. i adjusted some gains and played around with different settings.&nbsp; around a day later, while traveling down the road, a LOUD SCREECH/grinding noise comes through my speakers.&nbsp; turned the hu off and back on it was going,&nbsp; happens again.&nbsp; i thought something was killing my battery, turned the sub level down the neg 25 and i still get the screeching to make a long story short.&nbsp; read out from the HU is 13.9-14.1v. could it be a bad ground somewhere that is causing all of this trouble or could it be a sign of a bad battery/alt? i had both checked around a yr ago and they turned out fine, but that was a while back.any tips? i am planning to do the BIG 3 in a couple of wks try and eliminate the dimming of my lights.current setup:880prs,&nbsp;&nbsp; seas er18mids, seas tweeters, x200.4 and pioneer gm-5100t amps, 1 dayton ho 12.power wire from the batt to the pos distro is 4awg, from the pos distro to the amps are 8 awg.any help would be great appreciated.p.s. = amp doesn&#039;t go into protect as far as i can tell, voltage doesn&#039;t drop from the read out of the hu and happened with 2 different 880prs&#039;</blockquote>

[QUOTE="pellis, post: 3639337, member: 560163"] ok around 3 wks ago, i went out to my car. i adjusted some gains and played around with different settings. around a day later, while traveling down the road, a LOUD SCREECH/grinding noise comes through my speakers. turned the hu off and back on it was going, happens again. i thought something was killing my battery, turned the sub level down the neg 25 and i still get the screeching to make a long story short. read out from the HU is 13.9-14.1v. could it be a bad ground somewhere that is causing all of this trouble or could it be a sign of a bad battery/alt? i had both checked around a yr ago and they turned out fine, but that was a while back. any tips? i am planning to do the BIG 3 in a couple of wks try and eliminate the dimming of my lights. current setup: 880prs, seas er18mids, seas tweeters, x200.4 and pioneer gm-5100t amps, 1 dayton ho 12. power wire from the batt to the pos distro is 4awg, from the pos distro to the amps are 8 awg. any help would be great appreciated. p.s. = amp doesn't go into protect as far as i can tell, voltage doesn't drop from the read out of the hu and happened with 2 different 880prs' [/QUOTE]

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