How do i check for a bad harness to my radio? My aftermarket stereo worked in my civic but not in my GSR. Now i got a stock GSR stereo and it's plug n play. That doesn't work in the GSR either. How do i check for a bad harness? The fuse is good...

 

you need to check the harness with a multi meter, there are two fuses for the radio one is for memory and one is for ignition. most likely one of them doesn't have power.

 

What fuse did you check? First thing you wanna do is make sure you are getting power to the unit. Do you have access to a volt meter, or a test light?