The 120V in the back of the truck has reversed polar and does not does not have power on my children's playstation. I put the outlet tester and it shows hot/neutral reverse.

How do you take the panel out to switch the wires around? Or how do you fix it?

 

Easy fix...

Buy a 120 volt plug and receptacle, and half a foot of 120 volt cord. Switch hot with neutral between the plug and the receptacle.

 

I use mine all the time and seems to work well for charging camera, laptop and iPad. I will see what my tester says. These things are hard to wire wrong at the factory as they use plugs that can not be misfit.

 

Not a good idea, not very aesthetic . Don't want spaghetti running around back of the truck