12V 140A Split Charge Relay Kit with Pre-Wired Leads for Dual Battery

Keep your starter battery protected while charging your leisure battery automatically. This split charge relay kit manages power flow so you never risk draining the battery you rely on to start your vehicle.

Drive, camp, and work without worrying about power loss. The system charges your secondary battery only when your engine is running, then isolates it when you stop.

Reliable dual battery charging without manual switching

✅ Protect your starter battery by isolating it when the engine is off

✅ Charge leisure batteries up to 220AH while you drive

✅ Save time with ready-made leads and included installation components

✅ Avoid complex wiring with a voltage-sensitive automatic relay

✅ Stay powered on trips with consistent charging from your vehicle

✅ Keep your setup clean using included cable ties and fixing bases

The intelligent voltage-sensitive relay detects when your vehicle’s charging system is active. As voltage rises, it connects your starter and leisure batteries, allowing power to flow and charge efficiently. Once the engine stops, the relay disconnects them, preventing unwanted drain.

This design suits modern vehicles, including those with CANbus systems, because it works without needing an ignition feed or extra wiring. Everything connects directly using the supplied cables, making installation more straightforward with the included diagram and instructions.

With 140A capacity and ready-made cables, this kit supports reliable power distribution across camper vans, motorhomes, 4x4s, boats, and mobile work setups. The included fuse holders, terminals, and heat shrink tubing help ensure secure connections and organized routing.

Unlike pieced-together setups, this complete kit gives you all required components in one package, reducing setup errors and saving time sourcing individual parts.

Power your adventures with confidence while keeping your starter battery safe every time.

Keeps your dual battery system organized and ready.

Ensures stable charging between batteries while driving.

Simplifies installation with pre-made cables and parts.

Maintains reliable power flow in real-world use.

Adds safety with included fuse protection.

Reduces setup errors with matched components.

Helps achieve clean and efficient installations.

Guides clear installation with included instructions.

Provides everything needed in one complete kit.

Secures strong and stable battery connections.

Supports fast setup with organized accessories.

Keeps wiring neat and safely routed.

Delivers consistent charging performance on the road.

Helps ensure correct setup every time.