Lawrence,
I assume you have the old style Glow Plugs?
If you are measuring from the tip of the plug to ground, your results are almost right. The tips of the plugs should step down in voltage from the one where the power is fed in to the one where the just off the tip goes to ground.
I think a better way to test the plugs would be to measure resistance form the tip to the just off the tip. All of the these should show a very low resistance - I don't remember - it may be as low as 3 ohms - but they definitely should show continuity. But for this to work properly, you have to disconnect all the zig-zag wires and other wires to the glow plugs (on a five cylinder, some of the wires are zig-zag).
In general, if a plug is blown, the whole string doesn't work any more. That should show up in my test as one (or more) not having continuity. In your test, there would only be voltage until you got to the blown one.
(Mine blows out the back one - the first that the voltage goes to - so once it blows - no other plugs are getting voltage.)
Maybe someone else will have a better explanation of your results.
Bobby
#1 cylinder 10.5vdc. #2 nothing, #3 8.5vdc & #4 nothing. I think the problem
has been found. But how is it that some get voltage and some don't and some
less than others? I could be off but two cylinders get voltage and two don't.
Lawrence Rhodes........
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Toward freedom,
Bobby Yates Emory
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