Quote:
Originally Posted by bears4x4
is the glow plug relay located behind th e light on a 82 300td like the 85 discribed
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It is behind the drivers side (US models) head light and on the lower fender well. There is a plastic cover on it that comes off to get at the wiring and fuse.
Another way to find it is to trace the Glow Plug wires from the Glow Plugs back to the Glow Plug Relay.
This is what mine looks like with the cover off:

The large connector on the Left goes to the Glow Plugs and if you disconnect it you will see they are numbered. The connector in the center has some of the wiring that goes to the ignition and the Glow Plug light. On the far right is the shiny metal 80amp fuse (sometimes it gets hairline cracks and will not conduct).