Voltage drop please help!!

[Balingita]

I'm pretty sure I have it all done ill chec again, but everything is replaced to 0/1 gauge under the hood

 

[Balingita]

I'm pretty sure it is ill have to check again, everything under the hood is replaced with 1/0 gauge

 

[mlstrass 5,000+ posts]

Have the batts load tested and how do you know the alt is good?

 

[Bigmann6374 10+ year member]

Yea like everyone said it sounds like a ground issue. Just ground the **** out of everything. I run 3k rms on a stock 80 amp alt and never drop below 12.5 volts and I have like 4 ground points in my car all 1/0.

 

[gamehawk55 10+ year member]

Check over all your ground connections with a DMM also (set to measure resistance). If you see any of them having a resistance higher than 0.4-0.6ohms you need to re-do that ground for sure. The highest resistance ground in my whole setup (BIG 3 Grounds and amp ground) (amp ground is ZERO) is 0.6ohms, which some might say is high. But I'm running 2 SA8v2's on 1150W @2ohms and my voltage doesn't even drop below 14v at the battery except for on the biggest baddest bass notes that nearly send my amp into protection lol, and even then it only drops to 13.2-13.5v on a stock alternator //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif No idea why I don't get a more savage voltage drop but I don't. Maybe it's just cuz my Audison amp is super effiecient (my lights barely dim too).

 

[robert420 10+ year member]

i agree with everybody about the grounding. ****** ground = ****** performance. if the problem persists after you ground everything out, either upgrade the alt to a higher amperage, or run a second alt. to the back battery

 

[Balingita]

Changed the soundquest to cadence 1/0 and changed the grounds except the alt ground and saw some major improvement thanks alot guys, where do you guys suggest I ground the alt?

 

[gckless 5,000+ posts]

Changed the soundquest to cadence 1/0 and changed the grounds except the alt ground and saw some major improvement thanks alot guys, where do you guys suggest I ground the alt?

The alternator case is your "true ground" in your car.