03 suburban I don't have power to the aux cig lighter (key on only) port. I have power to the 20 amp fuse, fuse checks good. I checked for power at the socket, nothing, also put ground lead on the other cig lighter, still no power. This isn't a crucial deal, but I don't want to remember to unlug gps, backup camera all the time.

 

if you can access the connector to the lighter socket...check it for power and grd. if that is good, replace the socket.

some can be hard to access. with the special tool you can remove the lighter socket without removing anything else.