641 6 volt coil question

[Hobo,NC]

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Pix 2 today we call coil ramping its common to check coils this way and the most effective fast way. On modern vehicles its not easy to scope the secondary and normally not worth the time it would take. Then add in one small mistake the possibility of damage to your scope. Today we have misfire counters that are fairly accurate so unless you are a ungodly fast scope guru that only works on one make and model and the coils are EZ to access follow the code/misfire counter. If I have to pull a scope out I am in deep do-do.

4) Spark burn duration (burn time) is what is going on in the cylinder, Lean, rich, low compression burn that into your brain life will be good. I have not read all you posted I still have a day job.

I guess I did not ask the right question. I have another why did it take to so long to post that info?

 

[Tony Jacobs]

Pix 2 today we call coil ramping its common to check coils this way and the most effective fast way. On modern vehicles its not easy to scope the secondary and normally not worth the time it would take. Then add in one small mistake the possibility of damage to your scope. Today we have misfire counters that are fairly accurate so unless you are a ungodly fast scope guru that only works on one make and model and the coils are EZ to access follow the code/misfire counter. If I have to pull a scope out I am in deep do-do.

4) Spark burn duration (burn time) is what is going on in the cylinder, Lean, rich, low compression burn that into your brain life will be good. I have not read all you posted I still have a day job.

I guess I did not ask the right question. I have another why did it take to so long to post that info?

Not to worry my scope is a Sun model 1120 , currently 57 years old and points ignition only . I was giving everyone a chance to prove their point which of course no one did . Plus I was limited on how many pages I could post at once . Standard Electrical engineering was over 30 pages . GM Electrical engineering course for Mechanical Engineers got me down to about 20 pages . So I dumbed down to 1978 Freshman class Voc - Tech high school Auto Shop course using my Sun Scope to eliminate everything except points type ignition and that got me down to 9 pages .

 

[Tony Jacobs]

Please, read post #91 again.
Same coil with same voltage drop, what differs?

Do you know how to read ? The first paragraph on the first page clearly explains it . It is TWO different coils both with 1.5ohms resistance so both coils require a 1.5ohm resistor to be used on a 12 volt system . This is all based on a 1978 high school Auto Shop basic ignition course using a 57 year old Sun model 1120 Scope . I can’t dumb it down any further because I never saw a basic ignition course taught in pre-school , kindergarten or first grade . So if you can’t comprehend 9th grade I don’t know what to tell you .

 

[Tony Jacobs]

Oh my goodness! you just posted the exact thing that you said wouldn't work!
That states that a 6 volt coil at 1.5 Ohms works with an external resister of 1.5 Ohms in a 12 volt system just fine.
It also states that the newer designed coil works better. Something that no one here has a problem with. At least I don't, because that's what I replaced my 6 volt coil with when it finally died.

BTW Tony, concerning my 1964 Ford 4000. I found the boxes from the last 3 coils I got. The 6 Volt coil was on it and died. More than likely in the late 1990's. I remember raking hay and it just died. Was it the original coil, no idea, I just know it was the coil on it when I had it converted from 6 to 12 volts in 1986. Local AG teacher at Tech school did it when tractor was in for a rebuild. Cam shaft gear blew up. He added a Ballast Resistor to the wiring, put a Delco 10SI on it. I could finally put some lights on the 4000!

I went to the local Ford dealer, they sold me this:
CNH Original parts E8TF12029BA Made in Mexico - Didn't last long, going thru field with a rear scoop full of dirt and it just died. Lasted maybe 5 Years.
Lets say early 2000's. It was replaced by:

TISCO 290317 replaces Ford D5TE12029AB Made in USA
OEM applications
FORD TRACTORS
2000-3000-4000-5000 1965/UP
2600-3600-4600-5600-6600 1975/UP
12-VOLT
GEEEEEEE that says all the X000's from 65 up!

That coil still works, but I was chasing a short in the system and did an upgrade to all Blue Streak products.
Current coil:

Standard Blue Streak FD471
Made in Mexico.

Tony, you can have all those fancy tech documents and diagnostic tools, but when I am out in a field with hay down, I just need the tractor to RUN.
I think that was all any of us wanted, a Tractor that runs. We are not working on hot rods.

BTW, I can see that the wiring on the 1974 2000 I have is original. You can tell because the cloth over old wire with original ends on the wire.
I got it in 2023 after my cousin died. He was the second owner.

Have a GREAT day!

I suggest you read the FIRST paragraph on the FIRST page again because it states nothing that you are saying . So since you have no idea what coil was on it when your 64 4000 was converted , using that as an example is a moot point at best . According to Ford’s Consumer Electrical Technical bulletin number T-5 dated 12/89 coil E8TF-12029-BA is a Universal 6volt / 12volt coil . I have no idea what the construction of it is so I am not surprised they don’t last long . If you take into account the problems of using a 6 volt coil on a 12 volt system and using a 12 volt coil on a 6 volt system it’s a wonder they even bothered to build a coil like that . Ford coil D5TE-12029-AB is a 12 volt external resistance coil listed in a 1975 3 cylinder tractor parts books when the wiring harness had a resistance wire in it . Those Fancy Tech Documents you are referring to are a 1978 Voc-Tech High School Auto Shop course I took as a kid . The Fancy Diagnostic Tools you are referring to is my 57 year old Sum Model 1120 Scope for Points Ignitions ONLY . They were built from 1969-1977 just the type Dealerships bought back when these tractors were new . So if you can’t read and comprehend at a High School Level I can see why you arguing about this . As I said before Ford stated the date and serial number for the Wiring Harness change in a Service Bulletin which was October 1974 . Then a 1979 Ford Tractor parts book revision lists the change as August 1974 and yet again a 1990’s reprint of the same 1965-1975 Ford Tractor parts book list the change as October 1973 so regardless of which one is actually correct it did not happen in 1965 as Sean said it did . Since Basic Ignition courses were not taught in Pre-School , Kindergarten or First Grade I can’t dumb it down below 9th grade .