Charging Question

Farmall Cub Forum -- Questions and answers to all of your Cub related issues.

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.
Granto46
Posts: 26
Joined: Sat Apr 11, 2015 12:43 am
Zip Code: 70775

Charging Question

Postby Granto46 » Sat Feb 23, 2019 1:19 am

I am currently changing one of my 6v cubs over to 12v. I got everything hooked up and noticed when the tractor is off with the kill switch pushed in the ammeter slightly favors the discharge side and comes more to center when the switch is pulled out. When running the ammeter reads discharge. I did not change any wire connections on the kill switch and pretty much left the wiring the same on the ammeter. It was missing a wire from the kill switch to ammeter so I added a wire on the post from the kill switch the discharge post on the ammeter that also has a wire that goes to the alternator (one wire alternator). The other post on the kill switch has a wire going to the coil. The charge side of the ammeter has a wire that goes to the starter. I am guessing I need to swap the wires on the posts but is the ammeter I need to switch or the kill switch? Or am I wrong all together?

-Grant

User avatar
MiCarl
Cub Star!!
Cub Star!!
Posts: 362
Joined: Sat Dec 16, 2017 8:28 am
Zip Code: 48154
Tractors Owned: 1944 Farmall H
1948 Farmall Cub
1994 Speedex 1631
Circle of Safety: Y
Location: Livonia, MI

Re: Charging Question

Postby MiCarl » Sat Feb 23, 2019 8:13 am

From what you say it sounds like a magneto ignition tractor. If I've got that right there should be no connection between the kill switch and the ammeter.

When the switch is pushed in it shorts the terminal to ground, which would discharge the battery if connected to the ammeter. In fact, unless you added some sort of load it should draw enough current to let the smoke out.
1948 Farmall Cub
1994 Speedex 1631

Granto46
Posts: 26
Joined: Sat Apr 11, 2015 12:43 am
Zip Code: 70775

Re: Charging Question

Postby Granto46 » Sat Feb 23, 2019 8:41 am

It's a 57 and has a distributor if that changes anything

inairam
501 Club
501 Club
Posts: 1381
Joined: Wed Jul 08, 2015 10:24 am
Zip Code: 19342
Tractors Owned: 1948 with international 1000 loader 6v - Dozer
1949 with kub klipper belly mower. mag 6v - Mom
1950 with plow, 54 blade, mott mag 6v - Roxanne
1953 54 blade, c22, wood 42 6v
1957 with c-2 mower & c-54 grader blade 6v - barn Queen
1965 lo-boy with c-3 mower 12 v - Loboy
1975 with homemade mower 12 v - Horse
1979 long strip 12 v
Memberships: Rough and Tumble Engineers Historical Association;Chapter 8 IH Collectors; IH Collectors Worldwide
Circle of Safety: Y
Location: Glen Mills PA

Re: Charging Question

Postby inairam » Sat Feb 23, 2019 8:58 am

It is a one wire alternator?
Did you rewire the lights? Is the light switch on? The lights are not wired through the switch and will draw current.

Post on the wiring per the manual with should be the same behind the dash for the 12 volts viewtopic.php?f=1&t=103418
When you only have 9 horsepower you need to know the names of all of the ponies!

Granto46
Posts: 26
Joined: Sat Apr 11, 2015 12:43 am
Zip Code: 70775

Re: Charging Question

Postby Granto46 » Sat Feb 23, 2019 9:04 am

The light wiring is all there at the dash and fed to the lights but not hooked up. The light switch is off. I'll double check but don't believe any of the lights are connected to the kill switch

Eugene
Team Cub Mentor
Team Cub Mentor
Posts: 17815
Joined: Fri Jul 02, 2004 9:52 pm
Zip Code: 65051
Circle of Safety: Y
Location: Mo. Linn

Re: Charging Question

Postby Eugene » Sat Feb 23, 2019 9:55 am

https://photobucket.com/gallery/user/fa ... A==/?ref=1

Above link, wiring diagram for a 3 wire alternator. For a 1 wire alternator, completely eliminate wires #1 and #2 that are attached to the alternator.
I have an excuse. CRS.

User avatar
MiCarl
Cub Star!!
Cub Star!!
Posts: 362
Joined: Sat Dec 16, 2017 8:28 am
Zip Code: 48154
Tractors Owned: 1944 Farmall H
1948 Farmall Cub
1994 Speedex 1631
Circle of Safety: Y
Location: Livonia, MI

Re: Charging Question

Postby MiCarl » Sat Feb 23, 2019 9:58 am

I bet the ammeter is wired backward and the 0 on the ammeter is off a bit. When you power up the coil it draws some current pulling the needle toward the charge side. Start the tractor and it charges pushing the needle to a discharge reading.

Disconnect the battery. Wherever the ammeter needle points is where 0 actually is. While disconnected switch your ammeter wiring to the opposite sides.
1948 Farmall Cub
1994 Speedex 1631

Granto46
Posts: 26
Joined: Sat Apr 11, 2015 12:43 am
Zip Code: 70775

Re: Charging Question

Postby Granto46 » Sat Feb 23, 2019 10:02 am

That sounds like it could be it, not holding a true zero at rest. I'll try switching and see what happens.

User avatar
Glen
5+ Years
5+ Years
Posts: 3615
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: Charging Question

Postby Glen » Sat Feb 23, 2019 5:37 pm

Hi,
If you had the original 6 volt positive ground electrical system, and changed it to a 12 volt negative ground system, the ammeter will read backwards. You need to switch the 2 wires on the ammeter to the other posts, then charge should be shown to the right on the ammeter, like it was before.

Disconnect the battery ground cable before changing the wires at the ammeter.

The pointer might not quite be straight up when the engine is off. :)

Granto46
Posts: 26
Joined: Sat Apr 11, 2015 12:43 am
Zip Code: 70775

Re: Charging Question

Postby Granto46 » Sat Feb 23, 2019 8:22 pm

MiCarl and Glen were right. I switched the wires on the ammeter and everything is working as it should. The rest position of the ammeter needle favors the discharge side when off so no worries there. Appreciate the help. Now off to put in new brake pads


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall Cub”

Who is online

Users browsing this forum: Bill Hudson, Dale Finch, Gary Dotson, papscub, Stanton, tomstractor and 6 guests