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<blockquote data-quote="javisam376" data-source="post: 5650290" data-attributes="member: 596779">In short: I installed a 2 channel Sony 380WRMS amp connected to a subwoofer only and my lights start dimming when the subwoofer hits... new battery, new amplifier, big 3... lights still dimming....I measure the resistance in all my grounds and they are 0.2OHMS or less... used 4awg wire for the big 3 upgrade... 120Amp alternator... got the following voltages measuring AT the amplifier:Engine off / system down: 12.6V...Engine on / system off: between 14.54 and 14.62 with everyting off (lights, dome light, heater, rear defroster), between 14.58 and 14.66 with everything on (except the radio)...Engine on / system on: between 14.44 and 14.70 with low settings (gain -5, loud at mid), between 13.79 and 14.81 with gain at +3 and loudness on hi... everything else was on for both tests.... the dimming starts with the gain at 0 and loudness at medium...could that help to track down whats wrong with my system (alternator, amp, battery, something else)???do i need a HO alternator??? one of the reasons I got a med to small amp was to avoid throwing a lot of money in upgrading the electrical system...any help???thanks....</blockquote>

[QUOTE="javisam376, post: 5650290, member: 596779"] In short: I installed a 2 channel Sony 380WRMS amp connected to a subwoofer only and my lights start dimming when the subwoofer hits... new battery, new amplifier, big 3... lights still dimming.... I measure the resistance in all my grounds and they are 0.2OHMS or less... used 4awg wire for the big 3 upgrade... 120Amp alternator... got the following voltages measuring AT the amplifier: Engine off / system down: 12.6V... Engine on / system off: between 14.54 and 14.62 with everyting off (lights, dome light, heater, rear defroster), between 14.58 and 14.66 with everything on (except the radio)... Engine on / system on: between 14.44 and 14.70 with low settings (gain -5, loud at mid), between 13.79 and 14.81 with gain at +3 and loudness on hi... everything else was on for both tests.... the dimming starts with the gain at 0 and loudness at medium... could that help to track down whats wrong with my system (alternator, amp, battery, something else)??? do i need a HO alternator??? one of the reasons I got a med to small amp was to avoid throwing a lot of money in upgrading the electrical system... any help??? thanks.... [/QUOTE]

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