okay so i was swapping out my headunits from both cars cause im gonna sell one i changed the harnesses tested it out both headunits work after beeing exchanged then i turned the car off pulled the unit out put tape on the naked wirings and started it up and now for both cars the head units wont turn on any ideas why??? i checked the fuse one was blown up when replaced it still didn turn on

 

huh?

two cars, both have stock hu's?
aftermarket hu's?
what wont work?
what did work?

check the fuse in the engine bay as well?

what did you wire together?