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<blockquote data-quote="hcivic91" data-source="post: 7960690" data-attributes="member: 632672">I&#039;ve recently upgraded my electrical system because mainly because I needed a new battery.&nbsp; I killed the last battery or it was simply old so I took the opportunity to upgrade things.&nbsp; I got a high output alt, did the big 3 and got the biggest AGM bat that fit under the hood.This clearly helped as I could hear a audible difference in sub output.&nbsp; Last night I went from a 12&quot; getting 1000w to a 15&quot; on the same amp getting about 1500w.&nbsp; Thing is my lights seem to dim pretty good after the upgrade.&nbsp; From what I&#039;ve been told the upgraded alt is 200a and I have 1/0 guage under the hood.&nbsp; I am only running 4g to the amp though.&nbsp; The dimming seems strage given I only have a sub amp and its only 1500w and it is class d.&nbsp; One other thing, I can see a noticeable increase in headlight brighness when I go from idle to 1500rpm.How do I go about diagnosing the problem?Should I use the DMM to test idle voltage, 2500rpm voltage and then idel voltage with subs playing and 2500rpm voltage with subs playing?&nbsp; Oh, this is in a 2000 Lexus GS.I&#039;d be happy to upgrade wire and so forth but it doesn&#039;t really seem necessiary becuase I do not plan on running any more watts.Thanks guys,J</blockquote>

[QUOTE="hcivic91, post: 7960690, member: 632672"] I've recently upgraded my electrical system because mainly because I needed a new battery. I killed the last battery or it was simply old so I took the opportunity to upgrade things. I got a high output alt, did the big 3 and got the biggest AGM bat that fit under the hood. This clearly helped as I could hear a audible difference in sub output. Last night I went from a 12" getting 1000w to a 15" on the same amp getting about 1500w. Thing is my lights seem to dim pretty good after the upgrade. From what I've been told the upgraded alt is 200a and I have 1/0 guage under the hood. I am only running 4g to the amp though. The dimming seems strage given I only have a sub amp and its only 1500w and it is class d. One other thing, I can see a noticeable increase in headlight brighness when I go from idle to 1500rpm. How do I go about diagnosing the problem? Should I use the DMM to test idle voltage, 2500rpm voltage and then idel voltage with subs playing and 2500rpm voltage with subs playing? Oh, this is in a 2000 Lexus GS. I'd be happy to upgrade wire and so forth but it doesn't really seem necessiary becuase I do not plan on running any more watts. Thanks guys, J [/QUOTE]

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