Glow Plug is a device, just like a spark plug, used to aid starting an engine, in this case a diesel engine. The has a feedback line to the PCM to facilitate failure detection. The PCM operates the glow plug relay for max. 120 s at an engine coolant temperature below 32 °C. The glow plug is an electrically heated wire, the heat generated by the glow plugs is directed into the cylinders, and serves to warm the engine block immediately surrounding the cylinders.

The following schematic illustrates the Mazda BT-50 .

Mazda BT-50 Glow Plug Relay Schematic Wiring Diagram

1 From main relay
2 Glow plug relay
3 PCM
4 Glow indicator light (IC)
5 Glow plugs
6 Glow plug circuit fuse
7 From battery

Useful links to download:

    Speed 1254 kb/sMazda BT-50 Glow Plug Relay Wiring Diagram


   Speed 8987 kb/s[Verified] Mazda BT-50 Glow Plug Relay Wiring Diagram


   Speed 2547 kb/sMazda BT-50 Glow Plug Relay Wiring Diagram Direct Download


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