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.