is tted with a spiral pull off spring to make the gauge read ‘cold’ when the
ignition is switched off. The fuel gauge is very similar but retains its position
when the ignition is off.
When the system receives a supply from the ignition the resistance of the
thermistor determines the current owing through the coils. When engine coolant
temperature is low, the resistance of the sender will be high. This will cause the
voltage at point X to be higher than that at point Y. This will be above the Zener
voltage and so the diode will conduct in its reverse direction. Current will ow
through ...
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