(800) 853-2651
SHOP NOW

6 Volt Battery Wont Turn Cub??

A

Anvilheadtexas

Member
I am attempting to wire my 1951 Cub to see if I get spark and then later fire. I am going to by pass the ignition....as the dash has already been removed.

Yesterday I removed a 6 volt battery from my 1949 positive ground 8n ....to be used as the battery for the Cub test. The battery cranked and started the 8n fine. Last night I attempted a simple test of cranking the starter of the Cub by connecting the 6 volt to the starter with jumper cables. No go.

TO be sure nothing has locked up since the last test, I tried a 12 Volt battery and she cranked fine (all 6 volt wires are disconnected now so all I did was put 12 volts on starter).

I put the 6 volt battery on a charger all night. This am it tried to roll the starter, but no go. Why would this battery start my 8n fine, but not crank my Cub? What am I doing wrong.

Also, this battery has the caps to (I guess) fill with water??? The battery is a few years old. Any suggestions?
 
You could have a number of problems. Bad or to small of a battery cable. Or the stater is going bad and 12 volts will spin it but 6 will not because it is going bad. As I said a battery cable can be bad and yet look just fine on the out side
 
Well unless your jumper cables are say 0 or 00 in size they are way way to small to carry the amps needed to spin a starter on 6 volts. 6 volt systems draw high amps at low volts so yep you need bigger battery cables not the jumper cables
 
Even if you have super-heavy jumper cables, the clamps only have a small area of contact, just the tips of the teeth.

Usually the biggest problem is finding a good ground. Clamping on to rusty metal is usually the main cause.

Odds are the starter could probably stand to have the commutator cleaned up, new brushes, etc. regardless.

If you want to just see if you have spark, then just use the 12V for now. It won't hurt a thing to run 12V for a few minutes.

Or, hook the coil up to 6V and the starter to 12V. Just make sure to connect the same post from each battery (both +) to the tractor frame.
 
Charge the 6 volt battery overnight and then use a hydrometer to check the specific gravity of each cell. Then post the readings. Should see readings around 1.275. If one cell reads 1.100 you have a dead cell and you need a new battery. Hal
PS: You need 00 cables as been suggested. Clean all connections until shiny and that includes where your battery is grounded. Don't make them any longer than necessary.
 
Just make sure they are not the 2 gauge auto type or you will be back to where you where. On 6 volts you need 0 or 00 battery cable as in about he size of your thumb
 
I cleaned up the battery cables that came with the tractor, hooked them up to the 6 volt battery and guess what???? It cranked like a champion!!!! Thank you for the help guys....now to move onto the temporary rewire project.
 
You must log in or register to reply here.

Similar threads

P
Cub starter question
2
Replies
27
Views
835
560Dennis
560Dennis
grandpa Love
6 volt cub issues
Replies
18
Views
697
John T
J
P
Fooled again 300 u won't start in the cold.
Replies
16
Views
714
Paul 300 U
P
P
300 u 6 to 12 v conversion update problem
2
Replies
28
Views
928
Paul 300 U
P
M
SWD9 battery ground
Replies
7
Views
316
John T
J
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top