Diesel Sprinters use glow plugs to help combustion during cold starting and, on some operating strategies, after startup. Depending on model year and engine, the system may use a glow-plug control module, relay, wiring, and individual glow plugs. A hard start does not identify the control module by itself. What the Glow-Plug Control System Does … Continue reading “Expert Solutions for Mercedes Sprinter Glow Plug Timer Relay Failure in Norcross, GA”