I've owned 4 very different Porsche models in the past 3 years since I retired. I'm here to tell you the outlets will shut off if a load is connected, but will stay on if a sophisticated charger like my CTEK 4.3 is working.

 

Same here...mine doesn't and I also use it for my trickle charger. Will have to check out my wife's Cayenne next.

 

I do not know why Porsche doesn't have a switchable plug to turn off the radar detector. I had to purchase a fuse link and v1 cord to the fuse panel on the right hand side of the car. the V1 works fine now but what a PITA it was . My mercedes has a switchable plug Purchased all the parts on Amazon

 

FYI, they must have listened when the 991 models were made. The outlets in it switch off after about 15 minutes... but at still designed to allow the battery maintainers to charge the battery when plugged in.

 

The plug doesn't turn off after 15 minutes.

 

right

 

So seeking the truth, I decided to do a test . I have a tiny capacitive LED flashlight that plugs into the footwell outlet in case I ever need a little flashlight other than the one on my phone (in case I misplaced my phone for example!). It glows red whenever power is present, and no it never turns off when fully charged. It is always on when power is present. I normally have it in my old truck's lighter outlet where it is visible all of the time.

So I did a time lapse video with 15 seconds between frames. At exactly 15:00:00, I turned the car from running to off. I had the time lapse video app watching the passenger footwell outlet and it was running by 15:00:55. Then I closed the door and immediately locked the car.

At the time stamp at 15:35:11 the light turned off... so sometime within 15 seconds before that frame the footwell power turned off. This means it was on for around 35 minutes after I turned the car off or 34 minutes after I locked the car.

When I open the door just before 15:41:00, the power comes back on... but then I just close the door and leave the door unlocked. Interestingly it turned back off at around 15:47:00; so that time the power to the footwell turned back off in about 6 minutes.

Anyway, the power is certainly turning off (in my car at least!) and the timing of it appears to vary some with what the car was last doing and maybe whether or not it is locked. I could try that too if I must.

Here is the video with the timestamps. Since it is a time lapse it is only 12 seconds long.

http://www.vimeo.com/202457788

 

You do not say what car but as I said mine is a 2017 991.2 Cab. But yeah my manual could be incorrect.

 

Well, it's likely that the manual is approximate. I'll give it to you at 30 minutes for sure! I was mostly interested in empirically proving that it turns off.

Mine is a 2014 C4S Coupe. I don't know when I lost my signature with that... I'll have to put it back.

 

Don't think it is a hard and fast rule regarding minutes, just think that the computers measures the battery drain and shuts off the sockets if it senses a sufficient drain. For example after a long drive, with the battery nice and charged, the sockets may stay active for 15-30 minutes. However, if you have had the car parked for a couple of days, sockets may go off in 5-10 minutes.

 

Doesn't the passenger footwell socket sense when current is applied and stays on when a maintainer is attached? Plugging in an LED or any other draining device wouldn't tell you that.

 

Look back at Porsche_Nuts post in this thread, post #7. He explains it well there.

I was only talking about it cutting off drain for those members that might want to plug in a radar detector or dash cam there.

 

Ah. Read the whole thread. What a concept. Sorry. I should have.

 

Yeah it shuts off automatically (assuming the battery maintainer isn't plugged in). When charging the vehicle, all outlets stay live permanently.

Not sure why so many people are reporting it stays on. Strange.

 

There may be some differences in implementation between different models and years. Some report results without noting what car.