Adding a second battery

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Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=36501
Printed Date: May 01, 2025 at 6:42 AM

Topic: Adding a second battery

Posted By: mobilevt
Subject: Adding a second battery
Date Posted: August 21, 2004 at 7:40 PM

FS,

I just sold my 99 Ranger that had a secondary battery! I just used a 200w HD solenoid and put the battery in the back. I installed two 150a resettable breakers, front and back as close as possible to the batteries. 4g will work fine. Ground the second battery to the frame as good as possible with starwashers & bolts.

You can use an isolator but it cuts the voltage to the secondary battery by .8 volts. Solenoid connected to the ignition will work, you just have to choose ignition or accessory. If you will draw a lot of power from the secondary, hook it to accessory.

Best of luck!

Sean

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Replies:

Posted By: abachelier
Date Posted: August 29, 2004 at 8:58 PM

Fast Solutions wrote:

I have a 1999 Ford Ranger, and I need to add a second battery, I have a isolator but, I need to know which wire is the sensing wire off the alt. Also should I run 4ga. wire to the second battery?

Posted By: auex
Date Posted: August 29, 2004 at 9:11 PM

abachelier wrote:

Fast Solutions wrote:

I have a 1999 Ford Ranger, and I need to add a second battery, I have a isolator but, I need to know which wire is the sensing wire off the alt. Also should I run 4ga. wire to the second battery?

Learned to use the quote button already, huh?

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