G30 switched power supply.

[sjb993]

I want to hard wire a safety camera detector to a power source that switches off when the ignition is switched off via the STOP/START button. That is, not one which has the delayed power down of around 8 minutes.

Does anyone know a candidate fuse that I can piggy-back onto?

Thanks is advance for any answers.

[helix402]

If you buy a test light or make one you can test for one yourself.

[naturalaspiration]

Not sure if applicable, but in E66 there is one such cable in OBD port in the footwell. There is power only when ignition is in position 2 (engine runnig or start button pressed without a foot on the brake). As soon as I turn the engine off it cuts out.

[BFleming]

helix402 said:

If you buy a test light or make one you can test for one yourself.

And remember that things like the 12v sockets power down after 6 minutes or so, so switching the ignition on & off trying to find that switched 12V supply won't be easy.
On my F11 I have a 12v socket under the glovebox (next to the centre console) but I believe the G30 doesn't have that. Find the fuse for the 12V socket in the front fusebox & just piggyback off that?

[sjb993]

Thanks for the replies.

helix402, the 12V sockets have a delayed power down of several minutes, whereas I'm trying find something with zero delay.

In the G30 there's a convenient fuse board (Z44) under the dash on the driver's side, and there is a vacant fuse slot (F59) for a delayed power down 12V supply that most people seem to use. If I can't find a zero delayed fuse, I'll probably end up using that.

I have noticed that the heater blower switches on and off when the START/STOP button is pressed. Looking at the fuses in Z44, and assuming the heater fan is represented by a fan symbol in the fuse list, then fuse F37 may be a condidate.

I'm waiting for a probe tester to arrive so I can experiment.

BTW - does anyone have a fuse symbol decoder?

[BFleming]

Looks like this particular challenge has been already surmounted...
https://forum.bmw5.co.uk/topic/130066-hard-wiring-...

[sjb993]

BFleming - thanks, I had already seen this. They used fuse F59, but that has a delayed power down.