Split Charge Relay Kit, 6mtr 12V, Automatic Dual Battery Isolator Kit With 140AMP Voltage Sense Relay VSR, Compatible With RV Marine Car Vehicle Truck Caravan Camper Yacht ATV UTV Boats Workshop

Stop worrying about a dead starter battery killing your next adventure or workday. The Vevor 140AMP 12V Dual Battery Isolator Split Charge Relay Kit with Voltage Sense Relay (VSR) gives you fully automatic, intelligent dual-battery management — no switches, no guesswork, no dead cranking battery at the trailhead or boat ramp. Compatibility This universal 12-volt split charge relay kit is engineered to work across nearly every vehicle and platform in the US market. Pickup truck owners running Ford F-150, RAM 1500 and RAM 2500, Chevy Silverado, and GMC Sierra with secondary accessory or house battery setups will find this kit fits their electrical architecture perfectly. Overland builders, Sprinter-based camper van conversions, Transit cargo vans, Class A motorhomes, Class C RVs, travel trailers, and fifth-wheel caravans all benefit from the VSR's automatic charge-splitting logic. Off-road enthusiasts running dual-battery ATVs and UTVs get a 140-amp continuous rating that handles high-draw winches, LED light bars, and compressors without flinching. Marine applications including bass boats, pontoons, center-console fishing boats, and ocean-going yachts are fully supported. Any 12V environment — vehicle, trailer, or workshop — that needs reliable automatic charge management between a primary alternator-charged battery and one or more secondary house or accessory batteries is a valid application for this kit. Benefits • Automatic Zero-Intervention Operation — The VSR engages at approximately 13.3V when your alternator begins charging and disconnects at 12.8V when charging stops, protecting your starter battery without any manual switching required. • 140AMP Continuous Rating — Handles the high-current demands of winches, inverters, refrigerators, and lighting rigs that are standard in overlanding, commercial van, and marine builds. • Starter Battery Protection — Intelligent voltage sensing means your engine will always have enough cranking power; the relay isolates the auxiliary load the moment charging voltage drops. • 6-Meter Wiring Harness Included — The generous pre-cut cable run accommodates most truck beds, van rear compartments, and boat bilge installations without splicing or extending. • Simple Plug-and-Play Setup — Color-coded terminals and clear polarity markings reduce installation time to under an hour for most builds, even for first-time DIY installers. • Wide Application Range — Equally effective in recreational, commercial, and marine environments, making this a single kit that covers your entire fleet or vehicle collection. Technical Specifications • System Voltage: 12V DC • Relay Continuous Amperage Rating: 140 Amps • Relay Engage Voltage: ~13.3V (alternator charging threshold) • Relay Disengage Voltage: ~12.8V (load protection threshold) • Included Cable Length: 6 meters (approximately 19.7 feet) • Relay Type: Voltage Sense Relay (VSR) — fully automatic, no manual override needed • Application Class: Universal 12V automotive, marine, RV, and workshop • Fuse Protection: Inline fuse holders included on main positive leads Materials and Build Quality The Vevor VSR relay housing is constructed from heavy-duty, heat-resistant polymer that resists the high-temperature environments found under truck hoods, in van battery compartments, and in marine engine bays. The relay contacts are rated for sustained 140-amp throughput, meaning the internal copper contact surfaces are designed for continuous high-current duty rather than just peak surge ratings found on cheaper relays. Wiring cables in this kit use fine-stranded, flexible copper conductors insulated with PVC that remains pliable in cold weather — important for trucks and overlanding rigs operated in northern US winters. Crimp terminals are ring-lug style, pre-installed on cable ends, ensuring low-resistance connections at battery posts and relay terminals. Inline fuse holders are waterproof-rated, making them appropriate for under-hood or marine installations where moisture exposure is a real factor. Every component in this kit is selected for durability under the vibration, temperature cycling, and current loads typical of American truck, van, RV, and marine use. Installation Guide Installing this Vevor split charge relay kit is a straightforward one-hour DIY project on most vehicles. Begin by disconnecting your vehicle's primary battery negative terminal before handling any wiring. Mount the VSR relay in a secure, ventilated location — under the hood near the battery tray, inside the van bulkhead, or in the marine battery compartment — using the included mounting hardware. Route the primary positive cable (red) from your starter battery positive terminal through the inline fuse holder and on to the relay's main input terminal. Connect the relay's output terminal via the second positive cable through its inline fuse to your auxiliary battery positive terminal. Connect a short ground cable from the relay's ground terminal to a clean chassis ground point or directly to both battery negative terminals. Double-check all ring-lug connections are tight and fuse holders are fully seated. Reconnect the primary battery negative terminal. Start the engine — once alternator output reaches 13.3V the relay will click closed and begin charging the auxiliary battery automatically. Verify operation with a multimeter across each battery. Label your wiring runs for future reference. No programming, no switches, and no additional controllers are required. What's in the Box • 1x Vevor 140AMP 12V Voltage Sense Relay (VSR) • 1x 6-meter pre-cut wiring harness with color-coded cables • 2x Inline waterproof fuse holders with fuses pre-installed • 1x Set of pre-crimped ring-lug terminals • 1x Mounting hardware kit (screws and brackets) • 1x Installation instruction sheet Why Shop at Expedite At Expedite, we stock the electrical accessories, power management gear, and vehicle-specific parts that serious truck owners, van lifers, RV travelers, and marine enthusiasts actually need. We carry products with real specifications — not vague listings — so you can make a confident purchase the first time. Our customer support team understands dual-battery systems, overland builds, and commercial fleet electrical requirements. We stand behind every product we sell with clear return policies and responsive service. When your next build, trip, or workday depends on reliable power, shop with confidence at Expedite. Ready to stop worrying about dead batteries? Add the Vevor 140AMP 12V Dual Battery Isolator Split Charge Relay Kit to your cart today and get your dual-battery system wired up right the first time.