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wrote:
wrote:
My glowplugs don't and the engine heater light doesn't come on either,
though the engine starts quite happily with Easystart (don't like using

that too often)

What are the likely causes guys? There's a relay in the circuit called

an 'insulating relay & engine temperature relay, and an engine
temperature switch mounted in the thermostat housing.

I have a limited ability to follow circuits!

reached a certain temperature.

The most likely point of failure in that system, and likely also the
cheapest and easiest to fix, will be the sensor (or "sending unit")
that is measuring the temperature of the block or head.

Is the sender 'normally open' in which case, could I short it out to
see if that is the open part of the circuit?

No, I don't have a manual