I have the over priced Kimpex box on my '04' 650 Auto and want to hook up the tail/brake light. I was wondering how others have done it. I want to hook them up without actually cutting into the harness. I haven't looked real hard for 3 pin trailer light plugs but I'm pretty sure the 4 pins will work, would like some feedback on how it has been done in the past...Thanks

 

Those boxes are high dollar. Do you have the deluxe box with the extra (not for a passenger) seat?