Big 3 upgrade problem

[Darkspartan239]

It's at a normal 14.5 when the subs aren't on.

 

[adulbrich 5,000+ posts]

You can get your battery load tested and your alternator bench tested. Both are free.

If those are both fine, then it's your wiring and you just need to pick new ground points.

Simple troubleshooting really

 

[BOOMINGRANDPA 5,000+ posts]

I don't think it would be the battery or alt. I replaced the battery last summer and the alternator 2-3 months ago. But I'll definitely check my grounds. 

---------- Post added at 06:39 PM ---------- Previous post was at 06:38 PM ----------

 

FSD audio 700D amp, the car is a 2002 Chevrolet astro

yeah make sure they clean and if u see a bolt somewhere looks like it's on thicker metal than battery ground move it there.. yeah i got lucky with my alt but they all remans and like tahoe said sometimes takes u 1 yr of swapping to get good one..

 

[Boomin_tahoe 5,000+ posts]

It's at a normal 14.5 when the subs aren't on.

Hmm...could be a bad ground then someplace.

 

[Darkspartan239]

Alright so I put the engine ground wire in a different place and made sure to clean of the surface. It's still having a little trouble holding voltage. Should I try putting the two chassis grounds in different places because right now the battery and engine ground are in the same bolt on the chassis.

 

[Darkspartan239]

So when I brake or turn, the car almost died when I'm backing up or inching forward and not pressing the gas pedal.

 

[mahc 10+ year member]

Alright so I put the engine ground wire in a different place and made sure to clean of the surface. It's still having a little trouble holding voltage. Should I try putting the two chassis grounds in different places because right now the battery and engine ground are in the same bolt on the chassis.

strut bolt?

 

[Darkspartan239]

I put them on a bolt that was right under the hood, it looked like it already had a ground wire on it. It was like right above the battery.

 

[mahc 10+ year member]

pics?

 

[Darkspartan239]

How do I attach pics on here?

 

[mahc 10+ year member]

I use photobucket.

 

[Darkspartan239]

There is the ground connection

 

[mahc 10+ year member]

Not good. Try to find a bolt directly on the chassis.

 

[BOOMINGRANDPA 5,000+ posts]

So when I brake or turn, the car almost died when I'm backing up or inching forward and not pressing the gas pedal.

man that just sounds like bad alt, loose belt or messed up belt tensioner.. wire look good but yeah beefy metal always better..

 

[BOOMINGRANDPA 5,000+ posts]

hey guys can he ground to the alt ground bolt or just alt bracket or something? seen that done in video and it is bolted to heavy metal ususally