Rotisserie won't stay lit

With our Kenmore, you need to increase the gas flow another 1/4 turn once it's lit.

I bought 4 electric grills by Ducane the model is "take it or leave it" after continuous use of the grills of about 6 months the electrical connection and the heating elements were burned and i cant find the parts i need for this model of Ducane , I can't call the company it self to ask for assistance because they have subcontracted all parts and services to other companies and these companies that I have called they don't carry any parts for the electric grills only gas . If any one can help me i would appreciate it a lot as I depend on these grills for my part time work.
Thanks in advance
Emmaniuel