Open small panel at top center rear of dryer. Check for 240vac between two outside terminals of the connection block. With dryer unplugged, check that those terminals are tight and there is no burning or melting of wiring and terminals there. If all is good, with dryer still unplugged, open control panel and disconnect red wire from timer. Turn timer on and check resistance between terminals BK and R. Should be 0 (zero) ohms with meter on lowest resistance scale. If good, make sure disconnected red wire is not touching anything. Plug dryer back in and start it. Check for 120vac between disconnected red wire and timer WB terminal. If nothing there, heat circuit is open. Which parts did you replace besides heater coil? Provide photo of hi-limit thermostat and how orange wire is now connected.

Eric