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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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