Its the Black Wire.....
--If you 'Earth the black-wire with the Ign. on the glow-light will illuminate (The Timer earths this wire to turn on light)

Do this test with the four-pin plug off from the timer.

There is a Brown that should be 'deck'

There is a Purple that should go to the Starter Solenoid cable,

--And another colour I cant remember, but is 'switched Ign +B'....(For some reason, Green rings a bell, but not sure)

There is also a Thick red that goes (More or less) directly to the battery. This is the one that goes to the thick fuse-link at the back of the relay.

The other plug has the four (Or five) connections that go to each glow-plug...

--Just did the whole Glow-Plug installation into a Gasser so I remember the colour-codes

__________________
http://i190.photobucket.com/albums/z...0TDnoplate.jpg

Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....