Disconnect the battery, hook up your new equipment, connect the battery, test, repeat as needed. It’s not so bad if you’ve just got the one project, but if you’re restoring a car or doing extensive customizations, or if you’re racing, all that disconnecting and reconnecting can get old fast. Install this switch and you can disconnect the power with just a flick of the wrist — and you don’t have to mess with twisting or stowing the cables where they won’t flop back onto the battery terminals.
This Hella switch features a removable key — bad if you lose it, but great if you like the lockout/tagout procedures that keep others from electrocuting or maiming you. Street pricing is $20, and replacement keys run $8.