641 6 volt coil question

[Jim.ME]

A 641, heck any ford models before 1965, is not wired to supply 12 volts to a 6 volt coil while the solenoid is active.
Using the solenoid style that can be wired that way will disable the starter interlock safety feature.
Keith

It can be done by using a 5 terminal, isolated base solenoid. Standard Motor Products SS582 (Echlin ST83) is one. I believe Standard Motor Products SS590 (Echlin ST96 or ST96SB) is another that should work.

 

[Tony Jacobs]

It can be done by using a 5 terminal, isolated base solenoid. Standard Motor Products SS582 (Echlin ST83) is one. I believe Standard Motor Products SS590 (Echlin ST96 or ST96SB) is another that should work.

Yes sir Jim ST-83 works fine been using them for years . No modifications to the original Ford wiring harness , just a length of wire from the solenoid to the coil .

 

[Tony Jacobs]

That was the last official model year, but they continued to make small batches of various 4 cylinder models after that. Mostly the 4 cylinder 2000 offset model. They continued making those until the 1710 offset was release because certain customers kept demanding small offset tractors.

The Only 4 cylinder tractor that was built was the Offset . Ford documentation only shows it being built until 1969 . The Jap Scrap 1710 came out in the 80’s Ford wasn’t building any Offsets that long . Now wether there was any built Offsets sitting in some parts Depot that could have been a possibility but not one I was aware of .

 

[Tony Jacobs]

I had a 63 vw bug, 6 volt negative ground

Never worked on anything built by the Facist Five and never will never mind own one .

 

[Tony Jacobs]

Page from my veteran Neihoff electrical parts catalog.View attachment 158433

That’s interesting but as I said never saw it , never learned it . Never had a Chevy between the 1940-1954 year range because they were not in my interests . Failures like Nash , Packard and Studebaker were never interest to me either so I never payed any attention to them either .

 

[Keith Williams]

It can be done by using a 5 terminal, isolated base solenoid. Standard Motor Products SS582 (Echlin ST83) is one. I believe Standard Motor Products SS590 (Echlin ST96 or ST96SB) is another that should work.

I stand corrected.
Thank you for the detailed drawing.
Keith

 

[Tony Jacobs]

That’s interesting but as I said never saw it , never learned it . Never had a Chevy between the 1940-1954 year range because they were not in my interests . Failures like Nash , Packard and Studebaker were never interest to me either so I never payed any attention to them either .

Hello Duner , Now correct me if I wrong but from what I remember 6 volt positive ground was chosen because corrosion was a problem in the beginning years of the Automotive Industry . The old Wooden case tar sealed batteries with the exposed cell connectors on the top of the battery , the wiring and battery cables wrapped in cloth because the plastic coatings were years away from being developed . So between moisture / condensation , stray acid spills and being exposed to the elements all the time electrical systems had it pretty rough in the beginning even though they were pretty simple . Now Positve Ground was chosen because the flow of Electrons ? Through the wiring and cables was to keep the bulk of the corrosion on the ground side rather than the components themselves . (Versus today where we have to deal with corrosion on the Positive post because the flow is just the opposite) I suppose it was easier to replace those old braided ground straps and clean ground connnections rather than replacing or rebuilding components even they rebuilt everything back then versus rebuilding nothing today . Now fast forward to the early 50’s when the first overhead valve , high compression V8’s were coming out needing more cranking power . 12 volt Negative ground was chosen to be the Industry Standard because electrical systems were beginning to get more complicated . Capacitors, Diodes , Resistors , Transistors etc etc were being developed and used but all of these components liked to grounded on the Negative side . Now I’m sure companies like Nash , Studebaker and Packard thought they could change the Industry but for Packard the loss of millions through their failed attempt at changing over to 12 volt positive ground couldn’t come at a worse time because it was just another nail in the coffin for them . Now if Studebaker Big Wigs had been smart they should partnered up with Willy’s at the time and at least they probably would have survived because Studebaker did build a reliable product . Tony