You probably have some moist (grease) on the lens, or the optics has been damaged, i.e. lenses are not longer aligned correctly. This effect can be obtained by putting some vaseline on the lens, thus spreading the light that falls into the optics.
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A diesel uses glow plugs to fire the fuel when it is first started. If one glow plug quits working the glow plug controler shortens the time that the rest are on. If two its even shorter. If the wait to start light goes off sooner than it used to check the glow plugs.
Glow plugs can be checked easy with a test light.
Unplug a glow plug. (located on the head by the injector).
Just hook up a test light to battery positive (+) and touch the other end to the glow plug connector. If the light lights that one is o.k. Check all 8. Replace any that dont work.
If the glow plug system is working then check for fuel leaks. If fuel can leak out than air can get sucked in the fuel system and cause a hard start.
There is also a transfer pump on the frame rail under the drivers seat. This can be a issue if it fails.
When the key is first turned on this pump will come on and prime the system. You can hear it if you get close to it.
I hope this helps you. Re-post if you need more info.
If the glow bar is working (glowing) it is the gas valve. BUT, the glow bar can also actually glow and still not be working 100% and letting enough current through to the valve. You could swap an identical valve out to check it, if you don't have a meter. It's more than likely the valve though.
Yes you have a defective glow plug relay if you have your owners manual you can find it and replace it, the unit also has a timer on it, if you don't have a book look for the glow plugs and follow the wires from the glow plugs to where they terminate there you will find the relay unit and replace it, to test the glow plugs you remove the wires and test each plug by pulling off the wire and with a cheep ohm meter touch one end to the glow plug and one end to ground if it swings almost al the way over it is ok, if it dos not move then that glow plug is bad. if you find 2 or more bad then replace them all, and if a glow plug has shorted and caused this problem you will have to replace the glow plug relay. Good luck.
HAVE YOU REPLACED ALL YOUR GLOW PLUGS RECENTLY? EVEN THOUGH THE GLOW PLUGS APEAR TO BE WORKING I FIND WITH AGE THEY NO LONGER HEAT UP QUICKLY ENOUGH BEFORE CONTROLER TIMES OUT. THEREFOR CREATES A HARD OR NO START CONDITION.
The ignitor should be almost a white hot color very bright . If it is orange or kinda reddish, the ignitor probably isn't getting hot enough to open the saftey valve. you could check the amp draw on ignitor , but most of the time if the ignitor isn't glowing bright almost white , that is probably the problem, besides that if and only if ignitor was good then i would look at the saftey valve. My money is on the ignitor.:)
If it is a glow around the edges, it could be one of two problems. The Picture tubes could be getting soft or weak, or there is a bad capacitor in the screen drive circuit or in the sweep power supply. If you have a service manual and a multimeter, you should be able to locate a bad capacitor with an ESR type capacitor checker. If you do not have any knowledge on solid state repairs, please call in a pro to assist you in this repair. Good Luck.