Amazon.com: Top Post Battery Master Disconnect Switch …

Tested to exceed a continuous 200 amp load. Easy to Install Instructions: Disconnect ground (-) cable from battery and attach it to switch mounting post. Attach clamp end of switch to (-) battery post. Turn black knob fully clockwise to connect battery power. To disconnect power, turn knob 1/4 turn counter clockwise. Knob can be removed for …

https://www.amazon.com/Post-Battery-Master-Disconnect-Switch/dp/B001N729FS