Quote:
Originally Posted by JerryW235
I just did a detector install on a 2019 X5, and used the red/green for + and the black/brown for the -. It works, the only issue is the detector stays on for about 5 minutes after shutting the engine off and closing the door. It's the same whether the key fob is left in the car, the car is locked with the fob, the car is turned "off" via idrive or the Volume control. It seems to be the same amount of time that the ambient lighting stays on. The car settings are set to turn stuff off when the engine is off, and the door is opened.
Does anyone know where to find a hot wire that turns off immediately, and not on a delay? Any in the overhead console / switch panel for the roof and map lights?
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The best way to find an ignition-switched live in any vehicle is to use a multimeter.
Simply jam the black probe onto any source of Ground (-) and use the red Positive (+) probe to check each fuse in the various fuseboxes, starting with the fusebox closest to where you need the power.
Step one is to see which fuses are dead while the ignition is in the ‘Accessory’ state (no engine lights On, on dashboard).
Then start the vehicle and check again. Can you find a fuse that’s live when engine is running but dies when engine is killed?
If so, that’s your boy for toys you only want running only when the engine is.
You can buy ‘fuse taps’ -piggy-back connectors that allow you to grab power from a fuse socket without cutting into cables. They, conveniently, also allow you to fuse the supply to your accessory.