2003 Land Rover Range Rover L322 second battery

In this video, I review installing the second battery kit from Luxury Land Rover upgrades. The purpose of doing this is to ensure I have 100% power at the time of starting the 2003 Land Rover Range Rover L322. Often times, if the battery isn’t perfect, you will get strange error codes (trans failsafe, suspension errors, etc.).

This second battery will trigger when the car is started, providing additional power to make-up for any drainage the primary battery occurred while sitting. These L322’s are prone to drain the battery, even when parked.

A few key points:

  • The fuse I show in the video isn’t the proper one. I changed it to the fuel pump, as I state in the intro of this video
  • If you have a large battery drain, taking your battery below 9 VOLTS, the second battery won’t help. If the battery goes below 10V, I’m told this won’t engage when you go to start the car. I don’t know the technical details beyond this but what Luke at Luxury Land Rover Upgrades told me.
  • I used the NAPA battery that is identical to under the hood (bonnet). It’s a tight fit, but I got it in.
  • This video is long but designed to let you follow along as I install this kit. If you need step by step guidance, this is for you.

I hope you find this little project beneficial and useful if you plan to add a second battery. Be sure to subscribe to my YouTube channel and shoot me an e-mail if you have any suggestions.

About the author

Jason Miller

Enterprise software guy, Land Rover collector, and real estate investor.

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