Electrical question on 1947 8N

All non-Cub/Cadet/IH/Farmall/Case tractor and machinery discussions.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
zburton
Posts: 7
Joined: Wed Sep 13, 2017 1:05 pm
Zip Code: 44855
Circle of Safety: Y

Electrical question on 1947 8N

Postby zburton » Mon Apr 23, 2018 9:59 pm

Alright so I know this is technically not the correct brand of tractor but I figure its electrical and it would apply.

So the tractor has a 6v single wire alternator that is wired to the junction terminal then it went to the ignition switch and the amp meter the amp meeter goes to the starter solenoid and hooks on the same terminal as the negative bater cable. The ignition switch goes to a terminal that has the resistor but the previous owner did not keep the resistor in the circuit and hooked the coil strait to the ignition wire. Does that sound like it is right or not? it used to have a generator and voltage regulator but they took those out. It has positive ground.

Hopefully one of you could help me on this one, thanks in advanced.

RonT
5+ Years
5+ Years
Posts: 98
Joined: Sat Apr 20, 2013 6:04 am
Zip Code: 34448
Tractors Owned: 1950 Cub - Whitington
1989 Kubota L2050
1948 Willy's CJ-2A
1924 Model T Fordor
Location: FL, Homosassa

Re: Electrical question on 1947 8N

Postby RonT » Tue Apr 24, 2018 6:45 am

Are you certain the alternator is a 6V one?

Most folks would put 12V one wire alternator and change over to 12V negative ground to be compatible with the alternator.
If the electrical system is 6V, no ballast resistor is required in the primary ignition circuit.
If it is 12V, you either need a 12V coil that has an internal ballast resistor (it will say "no resister required"), or use the external resister in the circuit.

I hope this I helpful.

Ron

zburton
Posts: 7
Joined: Wed Sep 13, 2017 1:05 pm
Zip Code: 44855
Circle of Safety: Y

Re: Electrical question on 1947 8N

Postby zburton » Tue Apr 24, 2018 10:10 am

The alternator has 6v stamped into it and the battery is still positive ground. Not sure why the previous owner didn’t switch it to 12v they were practically there when they did it. So with it set up the way it is it can be hooked directly to each component then? Without any resistors.

User avatar
John *.?-!.* cub owner
Team Cub Guide
Team Cub Guide
Posts: 22855
Joined: Sun Feb 02, 2003 2:09 pm
Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.
Location: Mo, Potosi

Re: Electrical question on 1947 8N

Postby John *.?-!.* cub owner » Tue Apr 24, 2018 9:32 pm

If it is 6 volt, yes, not having the resister is correct. The resister is for dropping voltage from 12 volts to 6 for the coil when a 12 volt alternator is installed. 6 volt alternators are rare, and used to be quite expensive, in the area of $100 in the late 60s when I worked in an auto parts store while going to college. The reason we had them was the Missouri Pacific car shops were just across the street from us and some of their equipment used them. It took so long to get them through normal channels they would come and get them from us. We could have one in the store the next morning, it took them 2 to 6 weeks. They did not want to wait that long to get their own equipment for making repairs running.
If you are not part of the solution,
you are part of the problem!!!

Landreo
10+ Years
10+ Years
Posts: 1172
Joined: Tue Oct 19, 2004 7:10 am
Zip Code: 29130
Tractors Owned: fcub(5)
tricycle cub
154 (4)
Earthmaster (2)
JD 40T, JD 420 crawler-loader, JD MT
JD Unstyled A, Styled A, Unstyled AR
JD H
Centaur Tractor
AC Model C, G
Cub Cadets (9)
Gibson D
Red-E
Circle of Safety: Y
Location: SC, Ridgeway

Re: Electrical question on 1947 8N

Postby Landreo » Thu Apr 26, 2018 7:42 am

A ballast resistor is for more than 12v to 6 volt systems. Some Fords used them in their 6 v systems to further reduce the voltage to the coil. I am not sure about all of the N series but if the tractor has the original coil then it should have a 0.8 ohm ballast resistor.

A ballast resistor is different from a regular resistor and, in this case, allows more current to the coil when starting.

Not all ballast resistors are the same resistance. Don't use that 0.8 ohm resistor for a 6v Ford in a 6 to 12 volt conversion and don't use a higher ohm resistor for a 6 to 12 volts conversion in a 6 volt Ford.

You can measure the resistance of your resistor, 0.8 ohms then put it back in, 2 ohms or so then leave it out.


  • Similar Topics
    Replies
    Views
    Last post

Return to “Other Tractors and Machinery”

Who is online

Users browsing this forum: No registered users and 1 guest