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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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