Is this supposed to disconnect 100% of the current? Because mine doesnt

Yes. This switch cuts the load leg completely. If you are having draw issues, or you are showing power at one or both of the switch poles, I would disconnect both legs of the switch and test both cables for any power. If your vehicle/equipment has multiple features, it may be that you are getting power back-fed from the load/equipment/vehicle via a different power source.

I’m looking to easily connect and reconnect my negative battery cable. Will this work? I have a 250 amp alternator

I currently am running about 2 dozen of these as master battery disconnects on a fleet of mixer trucks. We are running 3 group 31 batteries through them, while cranking it sees in excess of 1500cca (for a few seconds) and they have performed nearly flawlessly. We use 160 amp alternators and at this point have only had one failure. Flaming River states on their website that it is rated for 250 amps continuous and 2500 amps for 5 seconds. I have tried quite a few others and these are the best ones I have found so far. Hope this helps, Good Luck.

When you turn the switch to the ON position, what happens when you let go? Does it stay in that position, or spring back to “off”?

Yes it will stay in lock position. And it works great. Sandman

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Flaming River FR1044 Battery Disconnect/BigSwitch with Lock-Out XL

Flaming River FR1044 Battery Disconnect/BigSwitch with Lock-Out XL

Product ID: 321514392

Details

Brand
Flaming River
Connector type
Plug In
Contact type
Normally Open
Current rating
250 Amps
Item dimensions L x W x H
20.3 x 17.8 x
Material
Aluminium

⚡250A continuous power

💧IP65 waterproof sealed

🔒Lock-out safety feature

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Description

🔋 Power up with confidence — the Big Switch that never quits!

LOCK OUT XL SAFETY - Enhanced lock-out mechanism guarantees secure battery isolation and peace of mind.
VERSATILE COMPATIBILITY - Perfect for trucks, heavy machinery, and off-road vehicles operating at 12V/24V.
RUGGED WATERPROOF DESIGN - IP65-rated sealed housing ensures peak performance in harsh environments.
HEAVY DUTY POWER HANDLING - Supports 250 Amps continuous and 2500 Amps surge for ultimate reliability.
PREMIUM SILVER PLATED CONTACTS - Maximizes conductivity and durability for long-lasting electrical integrity.

The Flaming River FR1044 Big Switch is a robust, manual rotary battery disconnect switch designed for demanding automotive and industrial applications. Rated for 250 Amps continuous and 2500 Amps surge at 12V/24V, it features silver-plated contacts and an IP65 waterproof sealed aluminum body. Its lock-out XL safety mechanism ensures secure battery isolation, making it ideal for trucks, heavy machinery, and off-road vehicles operating in extreme conditions from -40°C to +80°C.

Specifications

ASIN	B0130WZON2
Actuator Type	Manual
Brand	Flaming River
Circuit Type	2-way
Colour	silver
Compatible Devices	Automotive and industrial electrical systems, devices operating within 12V/24V and 250A/2500A (5 seconds) ratings
Compatible with Vehicle Type	Truck, Heavy Machinery, Off-road Vehicles
Connectivity Protocol	X-10
Connector Type	Plug In
Connector type	Plug In
Contact Material	Silver
Contact Type	Normally Open
Contact type	Normally Open
Control Method	Touch
Control Type	Manual
Current Rating	250 Amps
Current rating	250 Amps
Included Components	Flaming River Products
International Protection Rating	IP54
Item Dimensions	20.3 x 17.8 x 20.3 centimetres
Item Type Name	Battery Disconnect/BigSwitch with Lock-Out XL
Item Weight	45 g
Manufacturer	Flaming River
Manufacturer Part Number	FR1044
Material	Aluminium
Model Number	FR1044
Mounting Type	Wall Mount
Number of Items	1
Number of Positions	2
Operating Voltage	12 Volts
Operating voltage	12 Volts
Operation Mode	Battery,Electronic
Operation mode	Battery,Electronic
Specification Met	Operating Temperature: -40°c to +80°c / -40°f to +176°f; Environmental Protection: Ip65
Switch Type	Rotary
Terminal	Screw
Unit Count	1.0 count
Upper Temperature Rating	80 Degrees Celsius
Wattage	6000 watts

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€ 341.07

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In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Spain.

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TrustScore 4.5 | 7,300+ reviews

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