how do you tell if its just the indicator or the glow plugs too should it have voltage at the glow plug?
.... or it could be the switch.... if your using a meter, check EVERYTHING in the system.
I know my glow plugs are working, simply because "it starts".
I have not checked the indicator, I just turn it to the glow position for x# seconds (again, depending on local temp) or if its been running, just straight to start and she fires right up.
are you getting ANY smoke?
is it "attempting" to start and not run?
did you bleed the injectors?
it "may" have an electrical problem... you should be able to see voltage at the glow plugs with a meter, mine have exposed wires in series, so testing should be easy.
again, the switch may be fine "on the START circuit" allowing it to turn over, and at the same time, have "gunk" or a loose connection, or fuse, from completing the GLOW cicuit.
... then again... mine (glow indicator) "may" be working just fine, and using it in the bright sunlight, i've never "seen" the glow indicator... i've "looked" but if it WAS lit up, it was very weak.
trial and error.... narrow one thing down, check it, move to the next...
it could be ANYTHING... or it could be nothing at all, just take your time with it, dont get frustrated, and let us know what it IS doing.
Your decompression valve may be opened and keeping it from starting...
either way, your getting to know it.... seeing what makes it "tic".
good luck, we're here for ya.