Posted October 29, 200915 yr I currently have a 12" fi ssd (800 rms) with an alpine pdx 1.600 (600-700 rms), and I'm thinking of upgrading to 2 fi ssd 12"s with the new saz-1200d. I'm willing to upgrade from 4 to 1/0 wire, and I already have a yellow top, but will the stock alt in an 03 passat be able to keep up without terrible voltage drop?
October 29, 200915 yr well 1/0 wire upgrade is in my books a must have!! and how many amps does the 03 passat output (stock)?
October 29, 200915 yr Did you do the BIG3?x2, First do big three upgrade (battery ground to cars frame, engine block/alternator ground to cars frame, battery positive to alternators positive with 1/0 gauge wire). Then buy a volt meter to watch voltage, you should be eyeing batteries and if you have bad voltage drops then you know its time for a bigger starter battery if it can fit or just add a secondary battery in the rear are by the equipment.
October 30, 200915 yr I'm running stock alt (like 110-115amp) and stock battery in the front with big 3 in 0/1 guage and equipment in my sig with zero dimming issues. Between the secondary battery (Deka Intimidator 9A31) and big 3 it cost me like $250 or so. BIG 3 in 0/1 guage is definitely the first thing I would do.
November 2, 200915 yr Author Sorry, I forgot to mention I will definitely be doing the big 3 in 1/0 if that's the size I'll need. I think the stock alt on my passat is like 90 amps, possibly 120 but I doubt it. I just want to avoid an unsafe voltage drop when the subs are going.
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