200tdi glow plug wiring

Does anyone have a photo of what the wiring for the glow plugs on a 200tdi should look?

I have lists of wire colours etc., but my truck has been so...modified... over the last 25 years that I have no idea if what I have is what should be there. There is one thick brown are to the rear-most plug, with yellow and black wires from one plug to another. That's it, so I suspect it's not quite right.

Same as mine.

Sounds OK.

Thanks. In that case, it would be nice if they worked...

How do you know that they don't work?
What testing have you done?

A 200tdi should start just as easily without them, even in this cold spell within a couple of revolutions.
First step to test them is check for voltage at the yellow black wire after ignition is switched on (they will only come on for 5 secs or so), if that checks out then you need to remove them and check they glow