Power Adapters

I own a 2005 Mitsubishi Endeavor and I am having trouble with the Power Adapters. Only one of my front adaptors will work, one will not, the one in the rear passenger seating area does not work, the power adaptor in the rear cargo area does work. I have checked fuse’s and replaced one, but i cannot get them all to work. I have tried multiple chargers/ power adaptors to try to narrow down the problem. Can anyone help?

If the fuses to the power adapters (cigar lighters) are all good, then I’d suspect a bad ground that might be common to more than one. That is a pretty simple system. If you can get your hands on a wiring diagram, that will spell it out in black and white for you.