Yes — the True Smart Battery Isolator is a good fit for the Toyota FJ Cruiser, especially for owners who use their vehicle for off‑roading, camping, or overlanding.
Here’s why it works well:
Compatibility with the FJ Cruiser
- 12V Electrical System: The FJ Cruiser runs a 12V system, which matches the True isolator’s design.
- Alternator Output: The FJ’s alternator capacity (typically ~130–140A) is within the isolator’s supported range.
- Battery Types: Works with AGM, lithium, and lead‑acid batteries — common upgrades for FJ owners.
Benefits for FJ Cruiser Owners
Protects Starter Battery
- Prevents auxiliary loads (fridge, lights, radios) from draining the main battery.
- Ensures reliable engine starts even after camping overnight.
- Smart Automatic Operation
- Connects both batteries when charging voltage is high.
- Disconnects when voltage drops, isolating the starter battery.
- Simple Installation
- Compact design with a straightforward 3‑wire setup.
- Fits well in the FJ’s engine bay with aftermarket or custom dual battery trays.
- Overlanding Ready
- Perfect for powering accessories like winches, compressors, and inverters.
- Adds redundancy for long trips in remote areas.
Pros
- Directly compatible with FJ Cruiser’s system
- Protects starter battery automatically
- Affordable compared to DC‑DC chargers
- Compact and easy to wire
Cons
- Requires dual battery tray or custom mount
- Limited to ~140A alternator output
- No built‑in solar charging (needs separate controller)
- Less advanced charging profile than DC‑DC units
Bottom Line
The True Smart Battery Isolator is a solid choice for the FJ Cruiser. It’s reliable, simple to install, and provides the protection and auxiliary power management that off‑roaders and campers need. If you plan to run heavy accessories or stay off‑grid, pairing it with a deep‑cycle auxiliary battery makes the setup even more effective.