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Originally Posted by foxpaws
If it is preglowing ok but the light doesn't come on, would the bulb be the most likely culprit or a switch, fuse, or relay somewhere? ...He also doesn't like anything electronic, so the thought of trying to track down the reason for the preglow indicator failure makes him nervous. He wants me to just listen to the relay, but that isn't so easy...
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"If it is preglowing ok..." leads me to ask if you
know if it is pre-glowing OK, and how?
The pre-glow lamp will not light if 2 or more plugs are bad, or of #1 is bad. The relay will click on and off regardless how many plugs are bad.
We need to find out if it is indeed the lamp, or some glow plugs that are bad.
Let's be sure before we replace a light bulb, and a relay, only to find some other problem.