ground alt to battery neg terminal

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=119107
Printed Date: July 20, 2025 at 5:11 AM

Topic: ground alt to battery neg terminal

Posted By: rfhvhtoo
Subject: ground alt to battery neg terminal
Date Posted: January 04, 2010 at 11:45 PM

Hey im still having the spiking problem And I noticed all the suggestions especially the Ground from Engine to Chassis they keep saying sounds bad. I was watching yuobute and saw that someone has ground wires from their Alt to their Negative battery Terminal.

So Now Im wondering if i can have 2 0-gauge wires straight from an Alt-Bolt to the Negative Battery terminal and another to the Firewall for better efficiency... Right now I just have a wire from a random bolt on my engine that goes to a shiny metal part on the chassis to support my engine to chassis ground. I think This may Very Well Be the Jack in my a**. What do you guys think? is this safe?

PS: ive done everything else possible... and i just took the HO Alt out but i may have to give it another shot.

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Replies:

Posted By: zerepdivad
Date Posted: January 05, 2010 at 12:05 AM

It's not going to hurt anything. What size are your power wires for your alternator, and battery?

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A DMM is a beautiful thing.

MECP Advanced Installer Certified.

Posted By: rfhvhtoo
Date Posted: January 05, 2010 at 12:42 AM

zerepdivad wrote:

It's not going to hurt anything. What size are your power wires for your alternator, and battery?

their both 0 Gauge wires. and the voltage spikes between the alt and battery are lower than between the battery and amps by about .9 volts. So when i see the spike on the DC DMM at my amps at 15.9v the spike between the Alt and Battery was about 15v

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