Jeep Gladiator: Aux Battery Delete Guide (2020)

Hey guys! Thinking about doing an auxiliary battery delete on your 2020 Jeep Gladiator? You've come to the right place! In this article, we'll walk you through everything you need to know about removing that extra battery, why you might want to do it, and what to consider before you start wrenching. Let's dive in!

Understanding the Auxiliary Battery System

Before we get into the nitty-gritty of deleting the auxiliary battery, let's quickly break down what it is and why your Gladiator has one in the first place. The auxiliary battery, often called the aux battery, works in tandem with the main starting battery to power the Jeep's various electrical systems. It's particularly important for features like the start-stop system (ESS), which automatically shuts off the engine when you come to a stop and restarts it when you release the brake. This system is designed to improve fuel economy, but it can sometimes be a source of frustration for owners.

The main reason for having an aux battery is to handle the increased electrical load from modern vehicle features. Think about it: today's vehicles have complex infotainment systems, advanced safety features, and numerous electronic components. The aux battery helps distribute the power demand, preventing the main battery from being overloaded. Without it, the ESS system might not function correctly, and other electrical components could be strained, potentially leading to premature wear or failure. For those who do a lot of off-roading or use a lot of aftermarket accessories, the aux battery is there to supply the extra juice those devices require without draining the main battery completely and leaving you stranded. Think of it as a safety net that keeps your Jeep running smoothly. But, and this is a big but, some owners find the start-stop system annoying and are willing to sacrifice it for a simpler setup.

Why Delete the Auxiliary Battery?

So, why would anyone want to delete the auxiliary battery? Good question! There are a few common reasons. The most prevalent one is related to the aforementioned start-stop system. Many Jeep owners find the ESS feature intrusive and prefer the traditional driving experience without the engine constantly turning on and off. Disabling the ESS can be achieved by deleting the aux battery. Another factor is simplifying the electrical system. Some people prefer a simpler setup, especially if they're modifying their Gladiator for off-road use or adding aftermarket accessories. By removing the aux battery, they eliminate a potential point of failure and streamline the wiring. Weight reduction, while minimal, is also a consideration for some. Every pound counts, especially if you're trying to optimize your Jeep for performance.

It is important to note that deleting the aux battery might have some consequences. The start-stop system will definitely stop working, and some other electrical functions could be affected. It’s crucial to understand these potential drawbacks before proceeding. For instance, certain diagnostic codes might appear, and some features reliant on a stable voltage supply could experience issues. But, for many Jeep enthusiasts, the benefits outweigh the risks. They're willing to trade the convenience of the ESS for a more straightforward and reliable electrical system. Ultimately, the decision depends on your individual needs and preferences.

Potential Issues and Considerations

Before you grab your wrenches, it's essential to consider the potential problems you might encounter when deleting the aux battery. The most obvious consequence is the loss of the start-stop function. If you like that feature, then this mod isn't for you. Beyond that, you might experience some error codes or warning lights on your dashboard. These are usually related to the ESS system and can often be cleared with a scan tool. However, some codes might persist, requiring more advanced troubleshooting.

Another thing to keep in mind is the impact on other electrical components. While the aux battery is primarily for the ESS, it also helps stabilize the voltage for other systems. Removing it could potentially lead to voltage fluctuations, which could affect sensitive electronics. This is more likely to be an issue if you have a lot of aftermarket accessories that draw a significant amount of power. Additionally, consider the long-term effects on your main battery. With the aux battery gone, the main battery will have to handle the entire electrical load. This could shorten its lifespan, especially if you frequently use accessories or drive in conditions that demand a lot of power. Finally, be aware of any warranty implications. Modifying your Jeep's electrical system could void certain parts of your warranty, so it's always a good idea to check with your dealer before making any changes.

Step-by-Step Guide to Deleting the Aux Battery

Alright, if you've weighed the pros and cons and decided that deleting the aux battery is the right move for you, here's a step-by-step guide to help you through the process. Disclaimer: Working with automotive electrical systems can be dangerous. If you're not comfortable with this type of work, it's best to consult a qualified mechanic.

1. Gather Your Tools: You'll need a socket set, wrenches, screwdrivers, wire cutters, electrical tape, and a multimeter. A scan tool to clear any error codes is also helpful.
2. Disconnect the Batteries: This is the most crucial step for safety. Disconnect the negative terminals of both the main and auxiliary batteries. Make sure the terminals are secured so they cannot accidentally touch the battery posts.
3. Remove the Aux Battery: Carefully remove the aux battery from its mounting location. Take note of the wiring connections as you disconnect them.
4. Disconnect the Wiring: Disconnect all the wiring connected to the aux battery. You may need to cut some wires, so make sure you have enough slack to reconnect them if needed.
5. Bypass the ESS System (Optional): This step involves tricking the Jeep's computer into thinking the aux battery is still present. There are a few ways to do this, such as using a resistor or a jumper wire. Consult a Jeep-specific forum or a qualified mechanic for the best method.
6. Secure the Wiring: Securely tape off any exposed wire ends to prevent shorts. Neatly organize the wiring harness and secure it with zip ties.
7. Reconnect the Main Battery: Reconnect the negative terminal of the main battery.
8. Clear Error Codes: Use a scan tool to clear any error codes that may have appeared. Some codes may require a more advanced scan tool or a visit to the dealer.
9. Test the System: Start the engine and test all the electrical functions to ensure everything is working correctly. Pay close attention to the voltage readings and any warning lights.

Important Considerations During the Process: Ensure proper disconnection to prevent electrical shorts or damage. Secure all wiring connections, using appropriate connectors or terminals. Consider using a battery management system compatible with a single battery setup to optimize performance and extend battery life. After completing the deletion, monitor the vehicle’s electrical system for any unexpected behavior and address promptly.

Alternatives to Deleting the Aux Battery

If you're not quite ready to completely remove the aux battery, there are some alternatives you might want to consider. One popular option is to simply disable the start-stop system without deleting the battery. This can be done using various aftermarket devices or by reprogramming the Jeep's computer. This allows you to keep the aux battery in place while still avoiding the annoying start-stop feature. Another alternative is to upgrade the aux battery with a higher-capacity unit. This can improve the performance of the ESS system and provide more power for accessories. If you're primarily concerned about weight, you could replace the aux battery with a lighter lithium-ion battery.

Yet another option is to install a dual battery management system. This allows you to isolate the main and aux batteries, preventing one from draining the other. This can be particularly useful if you frequently use accessories or camp off-grid. A dual battery system also provides a backup power source in case the main battery fails. Before making any decisions, it's a good idea to research the different options and talk to other Jeep owners who have experience with these modifications. Forums and online communities are great resources for getting advice and learning from others' experiences. Remember, the best solution depends on your individual needs and driving habits.

Final Thoughts

So, there you have it! A comprehensive guide to deleting the aux battery on your 2020 Jeep Gladiator. Hopefully, this article has provided you with the information you need to make an informed decision. Whether you choose to delete the battery, disable the ESS, or explore other alternatives, remember to prioritize safety and do your research. Modifying your Jeep can be a fun and rewarding experience, but it's important to approach it with caution and respect for the vehicle's complex systems. Good luck, and happy trails!