w220 glowplug test

[hmang]

w220 s320 cdi 2002
how do i test the glowplugs

resistance is 0.9 ohm on them all
warning light on

removed and tried to see if they were physically glowing by earthing and turn on ign.
it worked on 1st 2 but then stopped.
even the 2 i saw work won't glow now

give us a clue

 

[Hibbo]

I think there are fusible links in the GP relay, open it up and have a look mate.

 

[hmang]

thanks hibbo
any clues where i might find the relay