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Odd glow plug circuit symptoms (in case useful to anyone else)


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Putting this in international as I think it may apply to 300 TDI's in general.

Relates to a '97 Disco.  Recently had some starter problems (Link to thread), all now resolved.  However, went out a couple of mornings to go and turned the key to "on",  the glow plug light came on and immediately off.  Tried again, same behaviour.  Turned to start, no starter motor.

At the "on" position, I could hear all the relevant relays click.  And on trying to start, the starter relay in the footwell clicked.  The wire from the battery to the glow plug relay was getting slightly warm, so I suspect that the plugs were working, just the timer on the light was acting oddly.

Anyway, blaming the new starter, off to one side with the turbo hoses, disconnect the main lead, reach behind to disconnect the solenoid feed and...

it was already floating around.  Sort of obvious why the starter wasn't turning.  So reconnect, re-attach everything, and all went back to normal i.e. glow plug light stayed on for  few seconds and the starter turned.

So, why the odd glow plug light activity?  Can't think of any reason for the lack of solenoid connection to affect the glow plug circuit/relay. A short when I turned the key would extinguish the light,  but the light went on/off before I turned the key to start, so no power to that disconnected wire.  

Anyway, all working again just fine, but if anyone has any hypotheses for this then feel free to reply!

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