How to Install a Dual Battery Kit on a Kawasaki Mule Pro-FXT

Having a dual battery kit on your Kawasaki Mule PRO-FXT gives your side-by-side the additional power to run a bigger winch, add some light bars, or upgrade to an awesome speaker system.

Aside from the dual battery kit, you'll need a few other parts to complete this job, including a second battery, and the hardware to house that second battery. Watch the video above and follow the steps below to do a Kawasaki Mule Pro-FXT dual battery upgrade.

Tools and Parts - Kawasaki Mule Dual Battery Installation

  • Ratchet and extensions
  • 10mm, 12mm sockets
  • 10mm, 12mm, 13mm wrenches
  • Pliers
  • Side cutters
  • Screwdriver
 

Kawasaki Mule Pro FXT dual battery kit

Kawasaki Mule battery band

 

NOTE: To install a dual battery kit on a Kawasaki Mule, you must also have installed an accessory fuse box. If you haven't already installed one, skip to the end of this article and watch our Kawasaki Mule fuse box installation video.

Kawasaki Mule side-by-side dual battery upgrade

Install Kawasaki Mule Pro-FXT Dual Battery Kit

Step 1. Remove the battery cover just behind the right side door, and then remove the airbox cover and air filter.

Step 2. Disconnect the negative battery cable from the primary battery to break the power circuit, which eliminates the chance of accidentally shorting anything while you work.

Kawasaki Mule dual battery installation setup

Step 3. Remove the panel that the accessory fuse box relay is mounted to, and install the secondary battery relay (from the dual battery kit) to the panel.

Kawasaki Mule Pro FXT dual battery kit installation

Step 4. Remove the ground bolt that holds the main ground cable and the accessory fuse box relay's ground cable. Connect the new ground cable (included in the dual battery kit) and the black wire running from the secondary battery relay. Reinstall the ground bolt with all four ground cables/wires secured in place.

Kawasaki Mule dual battery installation

Step 5. Reinstall the panel that now houses both the accessory fuse box relay and the secondary battery relay.

Step 6. Reach into the cavity beneath the air filter and remove the two rubber plugs.

Kawasaki Mule PRO FXT airbox

Step 7. Stick the larger rubber battery damper to the floor of the cavity below the air filter, and stick the smaller rubber battery damper to the underside of the battery band.

Step 8. Slide a battery bolt up through the innermost of the two holes in the cavity floor, then put the collar and one end of the battery band over the bolt and secure everything with a nut.

Kawasaki Mule parts diagram dual battery install

Step 9. Swing the upper battery band over so it sits on top of the primary battery. Slide the new secondary battery into the cavity, and swing the battery band back onto the secondary battery. Slide another battery bolt up through the outermost of the two holes in the cavity floor, through another collar, up to connect with the battery band and secure everything with another nut. Tighten down both nuts on the battery bolts to secure the secondary battery in place.

Step 10. Remove the primary battery's positive battery cable from the terminal on the accessory fuse box relay, and attach it to the positive terminal on the secondary battery relay (the terminal on the right).

Kawasaki Mule Pro FXT dual battery install

Step 11. Install the new positive cable (included in the dual battery kit) and one end of the new jumper cable (also included) to the positive terminal on the secondary battery relay that leads to the secondary battery (the terminal on the left). Install the other end of the jumper cable to the positive terminal on the accessory fuse box relay.

Kawasaki Mule PRO FXT dual battery kit installation

Step 12. Connect the bullet connector end of the smaller source wire (included in the dual battery kit) to the red wire with the bullet connector on the secondary battery relay. Make sure the connectors snap into place.

Kawasaki Mule UTV second battery installation

Step 13. Connect the other end of the smaller source wire to the accessory fuse box relay where the brown wire is connected on the left.

Kawasaki Mule accessory fuse box battery

Step 14. Put a new terminal cap onto the new positive battery cable, and connect it to the new secondary battery.

Kawasaki Mule side-by-side battery installation

Step 15. Take the new negative battery cable and connect it to the new secondary battery.

Kawasaki Mule dual battery connection

Step 16. Reconnect the negative cable to the primary battery.

Kawasaki Mule primary battery

Step 17. Reinstall the air filter, airbox cover and battery cover.

Kawasaki Mule dual battery installation final step

As mentioned at the beginning of this article, an accessory fuse box needs to be installed onto a Kawasaki Mule before installing a dual battery kit. Watch the video below to see how to install an accessory fuse box on a Kawasaki Pro-FXT

 

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