A remote isolator interface uses a vehicle's OEM remote (or aftermarket remote door lock) entry signal to interface between the battery and aftermarket electrical equipment, electronically separating the OEM systems/battery from aftermarket systems such that a short or power spike in the aftermarket system does not damage the OEM system. The invention also shuts off power to the aftermarket systems when the vehicle doors are locked by OEM remote entry or electric door locks, and can be combined with a magnetic battery disconnect to allow electrical current to reach the aftermarket systems when the doors are unlocked. The invention can also be combined with a fused distribution panel to become a single source of power for any aftermarket equipment, thereby eliminating the need for an installer to cut into the OEM systems for a power source and thereby void the manufacturer's warranty.