glow plug timer

[Yendor]

The temp sender for the glow plug circuit is the one with two wires the other one beside it with the single wire is for the temperature gauge.

The fitting in the inlet manifold with the two wires is a resistor for stage two of the glow plugs.

Stage one the glow plugs get full battery voltage.

Stage two the voltage to the glow plugs is reduced by the resistor.

The resistor is mounted in the manifold to help keep it cool (it can get very hot) and I also think to help heat up the air in the inlet manifold.