The glow plug control unit uses a glow plug relay to switch the current for the glow plugs on and off. The more glow plugs monitored by a control unit, the higher the current the circuit will need. To reduce the current needed, glow plugs are often distributed across two circuits, with two glow plug relays.
Please check whether the suitability and appearance of the product are consistent with your original parts before purchasing. If you are not sure about the suitability, please feel free to contact us.