Home FAQ

Do Ford Broncos have two batteries?

Short answer: No. Ford Broncos come with a single 12-volt battery in standard configurations. Some off-road builds or aftermarket setups may add a second battery, but there is no factory dual-battery option advertised for the Bronco today.

Context: Since its return in 2021, the Bronco has offered multiple trims and powertrains, but Ford’s published specifications for the Bronco’s electrical system hinge on a single main 12V battery. While enthusiasts sometimes pursue additional electrical capacity for heavy-duty off-road gear, such as winches or extensive lighting, these are typically aftermarket solutions rather than a factory-equipped dual-battery configuration.

What a Ford Bronco typically comes with

Below is a snapshot of the standard electrical setup you’re most likely to encounter in Bronco models straight from the factory.

Single 12-volt battery powers starting and most of the electrical system.

No factory dual-battery configuration is advertised as a standard option for Bronco models.

Some trims offer power features and outlets (such as USB ports and 120-volt outlets) that draw from the main battery, not a separate second battery.

In practice, this means the Bronco’s electrical load is managed by one main battery, with optional features and outlets designed around that single source.

Battery type and placement

The main 12‑volt battery is located in the engine bay and serves as the primary source for starting the engine and powering standard electrical systems. The exact battery type can vary by trim and production run, but Broncos rely on a conventional 12‑volt automotive battery configuration.

Considering an auxiliary battery

For enthusiasts planning intense off-road expeditions or installations such as winches, extensive lighting, or refrigeration, some choose to add a second battery. Here is what to know before considering a dual-battery setup.

Aftermarket dual-battery kits are offered by several suppliers and can provide a second battery, an isolator, and wiring tailored for off-road use.

Installation should be performed by a qualified technician to ensure proper charging, grounding, and compatibility with the Bronco’s electrical system.

Using two batteries requires careful management of charging (so both batteries stay charged) and may affect warranty coverage if not installed to spec.

In short, while the Bronco does not come with two factory-installed batteries, there is room for an aftermarket dual-battery setup for those who need extra power for off-road gear and accessories.

Summary

Bottom line: The Ford Bronco’s stock configuration relies on a single 12-volt battery. A factory dual-battery option is not standard, but an auxiliary battery can be added through aftermarket installations for off-road needs. For most drivers, one battery is sufficient; for overlanders and heavy electrical users, plan with a professional to assess whether a second battery is appropriate and how to integrate it without compromising the vehicle’s warranty or reliability.

Why do Fords have two batteries?

Diesel engines require just about twice as much energy to start as gas-powered vehicles. In gas-powered vehicles, it takes about four to six hundred amps to start, whereas a diesel requires about 800 to 1000 amps, which is why diesel requires two batteries.

Does a Ford Bronco have two batteries?

Both version offer two different engine options (for now) and both versions use two different batteries. Regardless of which engine is in the smaller Bronco Sports, they all use an H6 (also known as a Group 48) battery, for which OPTIMA Batteries offers a direct-fit replacement DH6 YELLOWTOP battery.

Can my auxiliary battery drain my main battery?

Yes, a faulty auxiliary battery can drain your main battery because they are wired in parallel, allowing a defective auxiliary battery to create a parasitic draw on the main one. This happens when the auxiliary battery develops an internal short or resistance, causing it to pull power from the main battery even when the engine is off.
This video explains how a bad auxiliary battery can drain the main battery: 48sRob’s RigYouTube · Apr 13, 2024
How it happens

Parallel wiring: The auxiliary and main batteries are connected in parallel, meaning they share the same electrical bus and are constantly connected to each other, except during a start-stop event.
Internal failure: If the auxiliary battery becomes weak or defective, it can develop an internal short or a condition that causes it to act as a constant load on the main battery.
Parasitic draw: This creates a parasitic draw, where the auxiliary battery continuously drains power from the main battery, eventually leading to the main battery dying and leaving you unable to start the vehicle.

What to do

Check the auxiliary battery: A failing auxiliary battery can cause warning lights related to the start-stop system. It's often the cause of your main battery dying, especially in vehicles with start-stop systems.
Replace the battery: The best solution is to replace the faulty auxiliary battery. Replacing both batteries at the same time is also an option.
Consider disabling the system: If you don't use the start-stop system, some people choose to delete or bypass the auxiliary battery entirely to prevent future issues.

This video demonstrates how to bypass the auxiliary battery system: 59sThe Garage StudioYouTube · Oct 30, 2024

What year is Bronco to stay away from?

You should avoid the 2021 and 2022 Ford Broncos due to numerous recalls and quality issues, especially with the hard tops. For classic Broncos, 1988 is a year to avoid because of electrical problems, and 1993 had issues with recalls, parking brakes, and transfer cases.
This video discusses reasons to avoid buying a Ford Bronco, including recalls and quality issues: 53sMaie HavenYouTube · Apr 23, 2025
Modern Ford Broncos (2021-Present)

2021 and 2022: These initial model years are associated with numerous recalls and quality complaints, particularly related to the hard top, engine, and various interior and exterior fit-and-finish problems.

Classic Ford Broncos

1988: This model year had a problematic electrical system.
1993: This year was plagued with recalls, including fire risks, parking brake issues, and problems with the transfer case slipping out of gear.
1980-1982: These models have a frame design with holes that can make it brittle and weak.
1990-1996: Many Broncos from this era can experience issues with the intake manifold gasket, leading to high engine idle, especially with high mileage.

This video discusses common problems in Ford Broncos: 59sExoticCar PlayPlaceYouTube · Jul 4, 2025
What to consider instead

Modern Broncos: Ford has addressed many of the initial issues in later models, so a 2024 or newer might be a better choice, although 2024 and 2025 models still had recalls for issues like improper fastener installation.
Classic Broncos: Aim for the fifth generation (1992-1996) or later, as these models are generally more reliable and safer.

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.