Glow plug prc6913

Here I have a glow plug relay which I got from LR show in Peterborough with a bit of wiring loom attached. Wire colours are
thick Brown n Orange
Thick Yellow n Black
Thin black n yellow
2x Black thin wire
Slightly thicker Black wire than Black n Yellow and the 2 Black wires.
Brown n red goes to ignition??
Yellow n black from glow plugs??
Black n yellow to instrument panel??
2x thin black......Not a clue
Slightly thicker Black than the 2 x thin blacks earth???
Can anyone help, I've got a 300tdi 95 engine

Cheers