Connect to the vehicle's 12V battery and negative ground. Ensure the black antenna wire is not connected to anything, as this would reduce the transmitter's range. Operating Instructions How A Cobra Alarm Works
A 5-wire control system that can manage total closure, including double lock and double unlock pulses. cobra 3865 manual exclusive
Triggers if any door, the hood (bonnet), or the trunk (boot) is opened while armed. Connect to the vehicle's 12V battery and negative ground