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: 54900180

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Details

Operation Mode
Electronic
Current Rating
250 Amps
Operating Voltage
24 Volts
Contact Type
Normally
Connector Type
Plug In
Brand
Flaming River

⚡250 Amps continuous power

💧Waterproof IP54 sealed design

🔒Lock-out safety feature

Description

🔋 Power up with confidence — the Big Switch that means business!

LOCK OUT XL SECURITY - Enhanced lock-out feature for ultimate safety and peace of mind during maintenance.
SILVER PLATED CONTACTS - Premium silver plating guarantees superior conductivity and long-lasting reliability.
UNMATCHED POWER HANDLING - Handles a robust 250 Amps continuous and 2500 Amps surge for peak performance.
SLEEK ITALIAN ENGINEERING - Precision-crafted in Italy combining style with rugged functionality.
BUILT TO BRAVE THE ELEMENTS - Fully sealed IP54 waterproof casing ensures durability in the harshest conditions.

The Flaming River FR1044 Big Switch is a heavy-duty electronic battery disconnect switch rated for 250 Amps continuous and 2500 Amps surge at 12V/24V. Featuring silver-plated contacts and a fully sealed IP54 waterproof design, it delivers reliable performance in extreme conditions. Its lock-out XL feature enhances safety, making it an essential upgrade for professional-grade electrical control.

Specifications

Operation Mode	Electronic,Battery
Current Rating	250 Amps
Operating Voltage	24 Volts
Contact Type	Normally Closed
Connector Type	Plug In
Brand	Flaming River
Terminal	Screw
Item dimensions L x W x H	8 x 7 x 8 inches
Circuit Type	2-way
Actuator Type	Manual
Contact Material	Nickel-plated Brass
International Protection Rating	IP54
Number of Positions	2
Upper Temperature Rating	8E+1 Degrees Celsius
Control Method	Touch
Connectivity Protocol	X-10
Color	silver
Wattage	6000 watts
Unit Count	1.0 Count
Number of Items	1
Manufacturer	Flaming River
Item Weight	1.6 ounces
Product Dimensions	8 x 7 x 8 inches
Item model number	FR1044
Is Discontinued By Manufacturer	No
Manufacturer Part Number	FR1044

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