Hi Jtcbradig6;
In addition to the information Orion provided, when temperatures do not get above 140°F in an empty cabinet, it is usually only the bisquette burner working and the heating element is not. You may have already done this, but it is worth another try. If you have a desktop computer power cord (NEMA5-15P to C13 ), plug that into the back of the cabinet, and the other end into a wall socket. If the element heats up, then the problem is either the short electrical power cord that connects the generator to cabinet, or the socket on the generator. Make sure the plug is well seated and don't leave this plugged in more than 20 minutes.
Next use the short power cord to connect the cabinet to the generator. Unplug and plug the short electrical power cord that connects the AC power from the generator to the smoker cabinet, several times. With a new smoker it sometimes takes many attempts to get the power cord seated properly. Also check the prongs to make sure none of them are missing, and check the sockets on both the cabinet and generator to make sure there is no objects that may prevent the plug from making full contact. If you have a multimeter, check the continuity of each wire on the short power cord.