Last week, I wanted to test the Porsche air compressor, so I dug it out, and plugged it into the console socket (where I plug in my Garmin all the time). When I started the compressor, it worked for a second and shut down. Then, idiot that I am, I consulted the manual, and discovered the cigarette lighter socket should be used for the compressor. I did so, and it worked fine.

A couple of days ago, before heading out on a drive, I discovered that my Garmin wasn't receiving power from the console socket. Nor did it receive power from the passenger footwell socket. The cigarette lighter socket worked fine.

Thinking I've blown a fuse, I checked the fuse panel map:
Row A, F8 is the 12 volt socket.
Pulled this fuse and it looks perfect.

All my other electronics appear functional, its just the 2 sockets that are kaput. Any ideas?

 

Check all the fuses-1 is the culprit.

 

+1 to PHX911. Also, even though the original fuse appears fine, just for grins, it might be worth trying a different fuse. It's possible, though not likely, that something in the circuit fried before the fuse blew.

 

+1 or check with a multi-meter for continuity.

 

This is a very common mistake--not reading the owners' manual. Of course, one would think that Porsche would have built all their 12V DC plug-ins with enough wire to handle the draw of any accessory. (I added one to my from trunk area and pull it directly off the battery so that I know I have plenty of capacity).

 

Thanks, guys!
Replaced the Row A-#8 fuse, even though it looked perfect to the naked eye.
Sockets now work again.
Examined the replaced fuse with a magnifying glass and could just see what appeared to be a small line in the centre of the filament. Used my DSLR and macro lens, and discovered that this line is really a break, separating the filament. I was looking for blackened metal and scorching.
Thanks again.

 

Good!
As someone suggested, a multimeter is best way to check a fuse, particularly the slo-blo variety. Pick up a cheap meter at the local Radio Shack, or get a baller Fluke.

 

+1 on the Fluke... after 20 yrs the digital display on my unit is finally giving up the ghost but it still comes thru if I tap it.

 

The one I have is a 1985 I think, so it may be reaching the end of the road?
I can only remember replacing the battery in it maybe twice, although it sits most the time.
Great tool