Dual battery and alternator

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Jun 8, 2023 | 01:33 PM

Cherokeedan420

Thread Starter

Newbie

Joined: May 2023

Posts: 21

Likes: 0

Year: 1989

Model: Cherokee (XJ)

Engine: 4.0 renix

Dual battery and alternator

So I deleted my clutch fan and put another alternator in its place next I plan to remove air box to put another battery in. I want to have one alternator and battery just for the vehicle and the second alternator and battery for auxiliary items. What all is required to make the second alternator run the second battery? Do I need some form of resistor? I just dont want to over charge the battery or it get too hot and explode. Any help is greatly appreciated.

Jun 8, 2023 | 02:55 PM

Jim Malcolm

Senior Member

Joined: Oct 2020

Posts: 934

Likes: 282

From: PA

Year: 1994

Model: Cherokee (XJ)

Engine: 4.0

What alternator are you using for the aux battery? A Renix CS130, or something else? CS130 is internally regulated.

Jun 8, 2023 | 03:23 PM

4.3L XJ

CF Veteran

Joined: Aug 2008

Posts: 6,588

Likes: 495

From: Chico, CA

Year: 1986

Model: Cherokee

Engine: 4.3L with headers and full 3" exhaust system

Youi need to isolate the battery except for the charging wire. To do this use a continuous duty golf cart solenoid. Turn it on only when you want to use the second battery