glow plugs 200tdi

i am in the process of putting a 200tdi engine and box out of a disco into my 1985 range rover
could someone tell me or send me instructions for wiring in the glow plug timer please
i have had a look at the disco there is five terminals on the relay/timer
one goes to the glow plugs,one goes to a permanent feed could someone tell me where the other three terminals link to
thanks to anyone who can help

i think one of them is to earth and another one to the ign feed/switch/live.
last one may not be used at all?