YELMO FAMILY LUSTRATOR, old model, metal housing. THE MOTOR, which is the type with brushes, DOES NOT WORK. I checked AND THERE IS CONTINUITY: between both brushes, between the motor inlet and outlet. I moved the coals and checked that they still have travel. The front light lamp is missing, but I imagine it is in parallel and does not affect the engine. As you can see, I find them in electrical things, but nothing more than that. I have tester, test lamp. What other measurement or check should I make to find the fault? Thank you very much and have a great year., Donoresteb