HOW TO Replace the Main and Auxiliary Battery on a Jeep JL Wrangler and Gladiator Truck w/o eTorque

Having your Jeep battery die really isn’t that big of a deal, especially if you have a set of jumper cables handy and another vehicle near by that's willing to help out. But, what do you do if you're out in the middle of nowhere and all alone? That just happened to Cindy and I and if you can believe it, on our Jeep JL Wrangler that's only about two years old! Fortunately, we did have our super compact, Type S Jump Starter with us and that was able to get us going again. However, once we got home, we discovered that our battery still wasn't holding a charge or at least, not enough to fire up the engine. All the lights worked, the radio played, windows opened and closed and even the dash lit up just fine - there just wasn't enough juice to get it to get it to crank.

Well, as some of you may or may not know, the Jeep JL Wrangler and JT Gladiator Truck WITHOUT e-Torque will have two batteries under the hood - a large traditional size battery that's used for cranking the engine and a smaller auxiliary one that powers everything else, including a relay that connects the two batteries together for cranking. Needless to say, even if your main battery wasn't dead, you could still have problems starting your engine if your auxiliary battery is dead or dying. I should note that we were actually seeing strange messages on the dash EVIC including one for, Aux Switches being temporarily disabled due to "Battery Charging" and another saying, "Service Shifter". So, when it comes time to replace one, you're more than likely going to need to replace both and for us, we decided to use the opportunity to upgrade our main battery to an Odyssey. I wish we could have upgraded our auxiliary one too but there really isn't a whole lot to choose from and so I just got a Super Start Platinum AGM battery (Group Size 400 SSB AUX14) from my local O'Reilly Auto Parts Store. In this video, you'll get to see just how easy it is to replace the main battery AND what all you'll need to do to replace the auxiliary one. We hope it helps you out.

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