- No one answered your question clearly, so I'll try to shed some light on how automotive electrical systems are generally designed. Most vehicles have at least three types of circuits (the examples in parenthese are typical, not necessarily how Lotus does it):
- only powered when starter is not engaged and ignition key is in the run position (e.g., radio)
- always powered without interruption (e.g., cigarette lighter socket)
- always powered except during start (e.g., parking lights and for some older cars, headlights)
The last type of circuit is designed to relieve the battery of large accessory loads while the starter is engaged. Lotus doesn't do as good a job at identifying these circuits as some other manufacturers. For example, VW uses a system of current tracks for which the nature of the +12V supply is identified.
You didn't say where your radar detector gets power (Lotus did not provide a radar detector power circuit), so there's no way for us to know what type of circuit powers your particular installation. You can obtain the wiring diagram for your particular vehicle from Lotus here