the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

grounding second battery


Post ReplyPost New Topic
< Prev Topic Next Topic >
maxxx 
Member - Posts: 32
Member spacespace
Joined: June 15, 2003
Location: Canada
Posted: January 11, 2010 at 12:27 PM / IP Logged  
I am mounting a second battery (Odyssey ER 30) in the rear of my 1999 VW passat wagon and plan to ground it in the rear to the same part of the chassis that the rear metal bumper is attached to. All of the stereo equipment hooked up to it (including the head unit) will be ground at the same point. FYI I will be using a pheonix gold capacitor power grid, which centralizes power and ground and makes it a little neater.
Any advice on grounding this setup? The stereo will be entirely isolated to the rear battery (even going as far as using relays for illumination, ignition, etc.) and as such I figure there should be no ground loop coming from the difference in potential between the two different battery ground points. Still, in addition to a substantial ground wiring setup for the system and the battery, I was considering running a ground wire (just a simple 8awg) from the rear ground point to the front battery's ground point. Is there any advantage to this, and if so should I consider using a heavier gauge? Or should I even consider not grounding the rear battery to the car but only running a heavy gauge ground all the way up to the primary battery?   Has anyone actually done a long ground run? I'll be honest I don't like the idea of a long ground run as an exclusive means of grounding a battery or system, particularly for a battery.
As you can imagine I will have an isolator in between the two batteries, and a Soundgate ICB100 (intelligent fuse), not that either of those matter to my questions. Thanks in advance for your input!
destination moon
haemphyst 
Platinum - Posts: 5,053
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: January 11, 2010 at 5:10 PM / IP Logged  
If your deck can be made to ABSOLUTELY float, then there will be no issues with ground loops... you are correct in that assumption. However, getting an ABSOLUTE float will be nearly impossible, as your amplifier's RCA shields will be connected to chassis ground through the amplifier, the antenna shield is a chassis ground...
That being said... I'd rather you didn't extend your ground cable any longer than is necessary. Also, the cap is a waste of time if you haven't updated your alternator. I'd also ditch the isolator. You're gonna eat batteries, dude.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Sorry, you can NOT post a reply.
This topic is closed.

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

  •  
Search the12volt.com
Follow the12volt.com Follow the12volt.com on Facebook
Wednesday, October 5, 2022 • Copyright © 1999-2022 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer