I wanted you to check the ground part of one of the sockets because if it is not still at ground, then there is likely a continuity problem with the wiring between the socket and the fuse panel in the trunk.
There are many ways for this to occur. - Someone removes the wiring connector and uses the feed for another purpose.
- Ground wire gets cut somewhere on the way to the back fuse panel
- Somebody continuously pulls high amps through one or both, leading to overheated wiring at the rear fuse panel and having the wiring at the high side of the fuse actually melt and become disconnected from that end of the fuse
- 12 volt supply wire gets cut on the way up to the sockets.
These are all guesses. With the battery disconnected, pulling the fuse panel is probably the easiest to start with since neither of them work.
And if you didn't pull the fuse to test it, do so now.
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