My input comes from an alpine kac-001 controller that outputs a -250ma trigger. will this work on a negative trigger or do i need a positive trigger?

Joinfworld Automotive 12V Relay Fuse Box with Wiring Harness has high capacity holder box. Integration of positive pole, to battery - Integration of positive pole, to battery +

Does anyone know what the full AMP rating is on this box? I'm trying to figure out what gauge wire and size fuse to put before this box from battery.

The Automotive 12V Relay Fuse Box with Wiring Harness has high capacity holder box, package includes 6pcs 40A Relays, and the wire gauge is 14AWG.

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Manufacturer	Joinfworld
Brand	Joinfworld
Model	12V Fuse and Relay Box Block
Item Weight	1.34 pounds
Package Dimensions	11.06 x 7.36 x 3.58 inches
Country of Origin	China
Item model number	RB-R6F6-W1
Exterior	Polished
Manufacturer Part Number	RB-R6F6-W1
Lift Type	Automatic
Wattage	4.8E+2

Joinfworld Relay Box 12V Automotive Fuse Relay Box Pre-Wired Universal Waterproof Fuse and Relay Box with 6 Relays and 6 ATC/ATO Blade Fuses for Car Truck Jeep Boat

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