cigarette lighter question

Yes of course you should have a fuse. If the "buss bar" is powered off of the ignition switch without any fuses what do think will happen if you get a short on the cigar lighter circuit? Without a fuse you run the risk of finding yourself stranded with a potential electrical fire. I am not familiar with the EZ wire kit, it may have circuit protection before the ignition switch in that case a cigar lighter short will only leave you stranded. I have seen many many many accessory socket fuses blown by cell phone/laptop/gps charger cords. Not blown by the device itself just the plug itself can be the problem. The socket has both power and ground and that is all that is needed for a crummy "made in china" charger to wreak some havoc