Coil and Radiant Electric Range

Hi, i have a problem with the cook top part of my range. we replaced the burner the 8 in front right. the burner did not heat up after reassembly. we returned the burner to the appliance store and the tech said we needed a new switch so we bought a new switch in the knob to turn on the burner. the ceramic indicatior light went on red immediately after turning on the burner but the burner did not heat up. We are stumped. Please help