BARNES 4WD B4WK12764 Jeep XJ and MJ Battery Box Installation Guide

: July 25, 2024
: BARNES 4WD

Table of Contents

BARNES 4WD B4WK12764 Jeep XJ and MJ Battery Box
Product Usage Instructions
Jeep XJ/MJ Battery Box Installation Instructions
Installation Notes
Contents of each box
Read User Manual Online (PDF format)
Download This Manual (PDF format)

BARNES 4WD B4WK12764 Jeep XJ and MJ Battery Box

Product Specifications

Compatible with: Jeep XJ/MJ Optima 34/78 and Odyssey PC1500, 34/78 Batteries
Materials: Stainless Steel
Includes: Battery Box Tray, Bottom Base Mount Bolt-On, Battery Box Top, Carriage Head Bolts, Nylock Nuts

Product Usage Instructions

Step 1
Disconnect the positive and negative cables from your battery. Remove the two nuts from the threaded rod holding the battery clamp. If installed, remove the bracket connected to the front radiator support. Remove your battery from the factory mount.
Step 2
Carefully remove the three nuts at the bottom of the factory battery tray. Retain the factory hardware for installation of the new mount.
Step 3
Remove the temperature sensor (if equipped) from the factory tray and disconnect it from the Jeep. Remove the factory tray from the Jeep.
Step 4
Bolt the bottom mount to the bottom side of the battery box using the provided #10 Flat Socket Cap screws and nylock nuts. Use anti-seize on the stainless steel hardware.
Step 5
Install the temperature sensor into the new battery mount and plug it back into the wiring harness.
Step 6
Install the new battery mount into the factory location using the factory hardware. Fully tighten the new mount.
Step 7:
Place your battery into the new mount and place the new battery top onto the battery. Secure the battery in place using 1/4-20 carriage bolts. Connect the positive and negative cables back to your battery.

Congratulations! You have finished the installation of the Barnes 4WD Jeep XJ/MJ Battery Box Kit.

Frequently Asked Questions

Q: Can this battery box fit other Jeep models?
A: This specific battery box is designed for Jeep XJ/MJ models with Optima 34/78 or Odyssey PC1500, 34/78 batteries. It may not fit other Jeep models without modifications.
Q: Is any special maintenance required for this battery box?
A: Regularly check for any loose bolts or nuts and ensure they are tightened securely. Additionally, monitor the condition of thebattery box for any signs of corrosion or damage.

Jeep XJ/MJ Battery Box Installation Instructions

Thank you for purchasing this product!

Installation Notes

The battery box is shipped raw steel, it will need to be painted or powder coated before installation.
This battery box uses the factory hardware that holds the factory mount in place, if the nuts or studs are corroded or broken, they may need to be replaced.

Tools required

7/16” Wrench or Socket
10mm Wrench or Socket
13mm Socket or Wrench
15mm Socket with Extension
3/8” Wrench or Socket
1/8” Hex Drive

Contents of each box

Bill Of Materials For B4WK12764 Jeep XJ/MJ Optima 34/78 Battery Box

QTY| Part Number| Etch Number| Description
1| B4W125163| 163 B| Jeep XJ/MJ Battery Box Tray
1| B4W125216| 216 B| Jeep XJ/MJ Battery Box Bottom Base Mount Bolt-On
1| B4W125164| 164| Jeep XJ/MJ Optima 34/78 Battery Box Top
4| 25C100BCG5Z| N/A| 1/4”-20 x 1” Carriage Head Bolt
4| 25CNNE0Z| N/A| 1/4”-20 Nylock Nut
3| 10C56KFCS| N/A| 10-24 x 9/16 Flat Socket Cap 18-8 SS
3| 10CNNES| N/A| 10-24 Nylock Nut 18-8 SS
Bill Of Materials For B4WK12765 Jeep XJ/MJ Odyssey PC1500, 34/78 Battery Box

QTY| Part Number| Etch Number| Description
1| B4W125163| 163 B| Jeep XJ/MJ Battery Box Tray
1| B4W125216| 216 B| Jeep XJ/MJ Battery Box Bottom Base Mount Bolt-On
1| B4W125165| 165| Jeep XJ/MJ Odyssey PC1500, 34/78 Battery Box Top
4| 25C100BCG5Z| N/A| 1/4”-20 x 1” Carriage Head Bolt
4| 25CNNE0Z| N/A| 1/4”-20 Nylock Nut
3| 10C56KFCS| N/A| 10-24 x 9/16 Flat Socket Cap 18-8 SS
3| 10CNNES| N/A| 10-24 Nylock Nut 18-8 SS

Step 1:
Disconnect the positive and negative cables from your battery. Remove the two nuts from the threaded rod holding the battery clamp. If installed, remove the bracket connected to the front
radiator support. Remove your battery from the factory mount.

Step 2:
Carefully remove the three nuts at the bottom of the factory battery tray. These studs and nuts can be corroded and easily break. Retain the factory hardware, it will be used to install the new mount.

Step 3:
With the factory tray hardware removed, remove the temperature sensor (if equipped) from the factory tray and disconnect it from the Jeep. Remove the factory tray from the Jeep.

Step 4:
Using the provided #10 Flat Socket Cap screws and nylock nuts, bolt the bottom mount to the bottom side of the battery box. We recommend using anti-seize on the stainless steel hardware.

Step 5:
With the plug end going in first, install the temperature sensor into the new battery mount and plug it back into the wiring harness.

Step 6:
Using the factory hardware, install the new battery mount into the factory location. The new mount can be fully tightened at this time.

Step 7:
Place your battery into the new mount and place the new battery top onto the battery. Use the provided 1/4”-20 carriage bolts to secure the battery in place. Run the carriage bolts in from the bottom side of the battery box. Tighten the nuts until the battery is secure. Connect the positive and negative cables back to your battery.

Congratulations! You have finished the installation of the Barnes 4WD Jeep XJ/MJ Battery Box Kit

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