2 things.
1....the 2030 has a relay (black box by the exhorst outlet) for the glow plugs, its notorious for failure, but not completely, I would change it.
2.. next test the glow plugs for continuity, should be around .9 ohms if I remember.
I always carry spares for the above even if they turn out to be ok, you then can cross them off the list.
Sorry cannot send photo, cannot make it small enough.
Odysseus
Bav 38