car Batteries

Home / the12volt's Install Bay / Relays / car Batteries (

Topic Closed)

Welcome Guest :)

Members

Search

Register

Login

< Prev Topic Next Topic >

cyruslam

Member - Posts: 20

Joined: May 09, 2006

Posted: May 10, 2006 at 7:55 AM / IP Logged

Hi everyone

I have a spare 12v car battery. i want to put into my car as a second battery to power the little 12v fridge.

I want to make a setup, when i start the ignition/engine of my car, both batteries on my car are being charged. And when i turn off, the second battery being isolated so that the frige wont use up the power on the main battery.

How can i connect the batteries? and how to make the above setup? can i do it with a relay?

Thanks a lot~~

Back to Top

mad550

Copper - Posts: 201

Joined: February 23, 2006

Location: Australia

Posted: May 10, 2006 at 8:21 AM / IP Logged

Battery isolator kit, most 4x4 shops stock them

WOW Sight and Sound

Maroochydore

Nothing is impossible!

Do it right the first time or don't do it at all.

Back to Top

ff-mike

Copper - Posts: 199

Joined: November 15, 2004

Location: United States

Posted: May 10, 2006 at 9:11 AM / IP Logged

Another source for isolaters would be RV stores

Yes, it can be done with a relay, and using a relay will allow faster charging than an isolater which drops the voltage across it. The only issue would be if the battery was highly discharged then there may be too much current for the relay to handle.

30- Main battery positive

85- ground

86- ignition switched 12V

87- Second battery positive

Back to Top

cyruslam

Member - Posts: 20

Joined: May 09, 2006

Posted: May 10, 2006 at 6:49 PM / IP Logged

Thanks for ur help.

no chance that i could DIY a isolator?

Back to Top

mustangfoo

Silver - Posts: 371

Joined: November 16, 2005

Location: United States

Posted: May 10, 2006 at 9:46 PM / IP Logged

read the above post, that is a DIY isolator, it is a bosch style relay that you would use on that

Back to Top

cyruslam

Member - Posts: 20

Joined: May 09, 2006

Posted: May 11, 2006 at 3:32 AM / IP Logged

ic......Thx a lot~~

I connect the Second battery positive to 87, what about the Second battery negative?

Back to Top

mustangfoo

Silver - Posts: 371

Joined: November 16, 2005

Location: United States

Posted: May 14, 2006 at 3:49 AM / IP Logged

yup no problem bud

Back to Top

cyruslam

Member - Posts: 20

Joined: May 09, 2006

Posted: May 14, 2006 at 3:55 AM / IP Logged

what about the Second battery negative? connect back to main battery??

Back to Top

ff-mike

Copper - Posts: 199

Joined: November 15, 2004

Location: United States

Posted: May 15, 2006 at 11:21 AM / IP Logged

Connect to ground, just like the primary battery.

Back to Top

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

Printable version

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

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.

car Batteries

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

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