Thank you for thanking me for telling you how to get the insulated cover off of the flat terminals, and suggesting you do this, and then tighten them up!
Motorcraft glow plugs, from the Ford dealer, are Beru, and as good as you can get.
It's time to get a test light, and probe at EACH glow plug, to be SURE they are all being powered up. There are fusible links, and various other things that can go wrong in the harness, preventing power from getting to one or more of the GP's. Just because the"wait to start" lamp is lit, it doesn't actually PROVE the GP's are getting power.
If one or more of the GP's is not getting power, or is "open" the system voltage will rise quicker than it should, signalling the controller to shut off the GP's SOONER.
In other words, the "glow plug on time" will be LONGER with ALL the GP's being properly powered than if there are one or more that are not heating.
Another thing you can do, IF you have access to a DC clamp-on ammeter, or an in-line ammeter is to do as demaris suggested, and check the AMPERAGE actually being drawn by EACH GP.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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