Engine Ground big three still dimming??

[vandiar2 10+ year member]

I'd recommend leaving the ground in the trunk, adding a run from the front to the rear will help, but it'll be better to leave the original ground in the trunk.

so what your saying is having 2 main grounds? Leaving the one in the trunk, AND the run from the back to the front?

 

[SPL Blazer 10+ year member]

Exactly, your ground in the back might not be as good as you think it is. I had mine grounded in the rear, then added a run of 0/1 ga from the front battery to the rear one and removed the rear ground. After doing this my voltage dropped too low on the big hits, so I put the rear ground back in and the voltage drops stopped.

 

[vandiar2 10+ year member]

Exactly, your ground in the back might not be as good as you think it is. I had mine grounded in the rear, then added a run of 0/1 ga from the front battery to the rear one and removed the rear ground. After doing this my voltage dropped too low on the big hits, so I put the rear ground back in and the voltage drops stopped.

good deal thanks man. just waiting on this wire and then im all over it. if that doesn't work im going to do what loopkiller told me to try.

 

[faiz23 10+ year member]

hey guys weather was a little better still cold and windy but good chance to get couple hours of work in

First thing i did was remove the battery and relocate the engine to chassis wire which use to be setup like the stock 8 gauge running to the negative terminal. Now the engine to chassis is grounded to the chassis at the same location where the stock battery ground is and the additional chassis to battery ground.

So i know have

1/0 gauge from alt to battery fused with 250 amp anl

1/0 gauge from battery to chassis

1/0 gauge from engine to chassis(same grounding point as battery to chassis)

i used a dremel and stripped all the paint in the surrounding area till i saw bare metal and then stripped more lol.

i check resistance on the ground i ran, my multimeter leads show .5ohm with touching the leads together,

when i removed the battery from the car, and checked the ground where i have the big three chassis ground and the ground in the rear. i disconnected the neg from the amp and shoved the lead into the 1/0 gauge. i get around .9ohm-1.1ohm. i figured with the .5 ohm from the lead already that would have my ground with a resistance of .4-.6 ohm.

i think the ground is good and i checked the seat belt bolt and couple other places on the car and all of them showed me the same resistance as my ground. Couple places showed resistance of like 1.5ohm.

i think my ground is goood, i threw a 150amp circuit breaker on the 1/0 gauge wire which runs to the back.

my voltage has stabilized my car starts around 14.3 and then on medium volume i drop to about 13.8-14.

if i have been doing heavy bass notes for like 5 min the voltage stays around 13.5-13.8.

turning on the headlights, ac on full, break light, hazard, bass on full, high beams my voltage drops to about 11.6-12.2.

i know i am gonna throw a battery in the back to stiffen it up and add more reserve.

i have a stinger spv20 coming and i already have a spv 70 sitting.

now this is my girls car and she never even goes past 60% volume, at around 75-80 is when i get heavy drops and dimming.

i do not want to throw such a big battery like the spv70 in the back it will be a waste, i already have a spv70 in the front and thought about throwing a spv20.

here is the info on the battery,

http://www.sonicelectronix.com/item_16771_Stinger+SPV20.html

i figure being a girl and even once i add my jl 450/4 v2, i think the spv20 should take care of her, if it was my car i know i love to jam my shit and i would throw a bigger batt.

what do you guys think and should i throw and isolator or just run it parallel since it is a small batt. I think to help out i might run a 1/0 gauge ground from the front to the back to help out.

so positive from batt to positive on batt in rear, fused twice,

negative from chassis and neg from front batt to rear batt.

 

[GMCJimmyslt2000 10+ year member]

those 1000/1s are power hungary

 

[faiz23 10+ year member]

oh hell yeah **** right the 1000/1 are power hungry,

i am hoping that once i throw a second battery in the back along with another run of ground and actually getting my anl fuseholder and distroblocks.

i have it setup with just a 150 amp fuse upfront,

i would like to setup a 300 amp fuse up front and then 100 amp and 60 amp in the back, after i get the tap from the back battery.

that should help relieve the bottle neck and make it easier for current to flow and have a second battery to stiffen it up. right now my voltage has stablized and tends to stay about 13 as long as i am not bumping extremely hard with all the accessories on. Incase i need i will bump the rear battery to a kinetick 800 or a spv 70.

i am sure i will get the dimming taken care of but it is fun seeing all your improvements by doing the big three, changing grounds or checking resistance. i am eager to see what a second ground to the rear will do and what a battery will do. i would like to have the voltage about 13.8 on hard hits and about 13 with all accessories and a hard bass. right now i dip into 11.7v and want to gain about 1 volt stability from a battery, second ground.

 

[mendon mafia 10+ year member]

I'd recommend adding a 0/1 ga ground from the engine block directly to the chassis. The battery might be a little small for 1000 watts plus everything needed to supply the vehicles demands. Since you already have an extra battery try adding it to the rear with a 1/0 ga run, and see if that helps. If not then the alt might be the problem.

just to clarify that batt is PLENTY big enough for your amp. im using 2 and im running 5kw. my stock battery up front is basically non existent too its pretty muchall the stingers. i do have a 200 amp alt tho but that shouldnt matter. i ram 1000 rms on my stock electrical (130 amp alt, stock batt, no big 3) and had not that bad of dimming.

 

[faiz23 10+ year member]

i figured the spv70 up front and a batt half the size of that so a spv 35 would be sufficient for the whole system expecially for a chick lol.

i got a good deal on a spv20 and really don't want to spend any more than i have to knowing she will never even crank the system up. She LOVES the BLUETOOTH handsfree built into the headunit. I do not forsee her cracking up the conversation to listen to the bass in my voice lol.

She usually does not even crank up the bass so while she is in the car there is no dimming. the issue starts when i get in an crank that biatch up, gotta make sure the w7 still pounds lol.

I will keep you up to date what happens once i throw the battery in and the effect of the additional ground.