How to Install a Battery Kill Switch

Summary by Krater

This video provides a complete, step-by-step tutorial on how to install a battery kill switch and fire suppression pull cables in a track car. It covers wiring, running battery cables from the trunk to the dash, fabricating a custom mounting bracket, crimping heavy-duty wire and terminal connectors using hammer, hand, and hydraulic crimpers, adding a resistor to protect the alternator, and testing the system to ensure it completely isolates the electrical system and kills the engine.

From the video

Answers: How do you install a battery kill switch in a car?

• Battery kill switch installation
• Track car electrical isolation
• Heavy-duty wire crimping techniques
• Alternator protection wiring with resistor
• Fire suppression pull cable installation
• Custom aluminum bracket fabrication
• BMW E46 track car build

What it concludes

• A battery kill switch completely isolates the alternator and battery, eliminating all electrical flow and instantly killing the engine in the event of an emergency.
• Using a razor blade to cut thick battery cable insulation ensures no copper strands are cut or lost, maintaining maximum electrical conductivity.
• Heat shrink must be added before crimping terminal connectors onto battery cables.
• Hammer, hand, and hydraulic crimpers can all create solid, professional-grade crimps when the correct size and technique are used, but hydraulic and hammer crimpers yield solid single-piece copper blocks without air gaps.
• Silicone paste applied between the terminal connector and wire insulation prevents moisture from getting in and causing corrosion.
• Filing and smoothing sharp burrs off crimped terminal connectors prevents the heat shrink from being cut when it shrinks down.