The window of my Honda civic 2000 SI had stop to run. It is an electrical system. First I was thinking that it was the motor and the regulator but I just bought a new regulator and it still not work. What could it be? Everything else electric in my door is working.

Test with a test light at the switch for power if power is present the switch may very well be faulty if no power exists then ck the fuses if all are good the issue most likely resides within the rubber boot between the doorjamb remove it and check for power starts and ends and repair as necessary with a wire connector or a new length of wire