I already gave you the correct numbers for just about every brand of plug that goes to your 6.9.
The brand of the plug won't make a bit of difference in actual starting - except - dual-coil self-regulating plugs are basically burn-out proof, while many other's are not.
I agree with Bob that there isn't any better out there than the dual-coil Beru plugs. That being said, the single-coil Berus will burn up just as fast as an Autolite, Champion, Delco, etc. Bosch, Wellman, Delphi, etc. all sell dual-coil plugs now that hold up just as well as the Berus. If you buy new plugs today from Ford or GM - you get Beru dual-coil plugs. It may cost a few bucks more that way - but sometimes it's easier going to Ford if you need them in a hurry.
As I said before - if you want to be sure - you need to check with an ammeter - one by one with each glow plug. It's easy to do and takes little time - and saves a lot of guess work. I already gave you all the test specs.
In regard to what Alan said about the 6.9s being tough starters? Maybe somewhere - but not with any of mine. My 85 6.9 and my 94 7.3 are both excellent cold-weather starters. Same with my Isuzus and my Dodge-Cummins. Only bad starters I've ever had are my GM 6.2 diesels. The best of the lot is awful - and the worst id more awful. My 1985 with the 6.9 can sit for two months - and then I go out and try to start if at zero degrees with no block heat - and after 15 seconds of glow-plugging it starts right up. With my 6.2s? At zero - you can more-or-less forget it unless you've got the block heater plugged in. And at 45 degrees F above? They still need a good 10-14 seconds of glow-plugging. My 85 6.9 currently has Motorcraft ZD1A plugs - Ford # E5TZ12A342B - which came as either Bosch or Beru years back and now are usually only dual-coil Beru.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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