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["Don Bowen" <don.bowen AT earthlink.net>]

> I"m new to diesels, so what does the block sending unit do, sense the
> temperature of the glow plug?  The little glow plug light on the dash
> stays on only briefly in this summer weather.  I find that it fires up
> faster with just a touch of throttle

The glow plug circuit has several elements.  There are the glow plugs, the
switch, and the block sensor.  The computer reads the block sensor to turn
on or off the glow plug switch as well as the light.  In summer there should
be few problems but in a New York winter things will be different.

Don Bowen  KI6DIU
http://www.braingarage.com/Dons/Travels/journal/Journal.html