Best battery for a 1940 ford 9n, 12 volt conversion

timothypkoon

New User
I need a 12 volt battery for my converted 1940 9n. I'd like one to fit the original battery tray if possible. Also with as high amperage as possible
 
The original 6V battery is Group Size 1 - 9-1/8 (L) x 7-1/8 (W) x 9-3/8 (H).

12V Group 25 & Group 35 batteries are just slightly smaller at 9-1/16 x 6-7/8 x 8-7/8.

I always run the N's to operating temp every 3 or 4 weeks if they haven't been used. To make sure the battery doesn't discharge, all the N's now have Battery Tender float chargers. (And that will extend the life of any battery because it stops them from discharging.)I use Deka or Duracell batteries in all my tractors.

I also keep everything "clean, bright & tight", use the braided strap & 00 gauge negative cable.


Got a Batteries & Bulbs store near you? They sell Duracell batteries made by East Penn. They sell Group 25 & 35 Duracell batteries for $119, and Battery Tender float chargers for $35.
75 Tips
 
The N series Fords have neither a big displacement nor a high compression engine so a big capacity battery isn't necessary. If they are tuned and maintained right it doesn't take much to start them.
 
(quoted from post at 22:09:32 10/23/18) The N series Fords have neither a big displacement nor a high compression engine so a big capacity battery isn't necessary. If they are tuned and maintained right it doesn't take much to start them.

I've been jump starting my 9N with a 12V lawn mower battery, works great, it fires it right up. Plan to do 12V coversion once I get the 8N done to replace it.
 

The disadvantage of a 35 is the post are set out on the edge of the battery. On a 25 they are set in that gives needed clearance like the 6V had for a original are aftermarket top hold down plate.

No battery leaves here flopping around they get tied down a 25 makes life easier...
 
Yep, what RM-MN and Bruce(VA) said go. A 550 CCA battery will do the job effectively. I recently purchased a DEKA 12V GRP 25 battery for about $90 for a friend's 9N. If you have non-starting issues, you could possibly have other issues. A good battery is very important whether 6V or 12V, and with proper PM on it and the rest of the electrical system, will give satisfactory performance for years. You need a strong battery to:

1. Close the solenoid *(OEM 9N & 2N starters never had a solenoid- they were a new feature introduced on the 8N Model)
2. Spin the starter
3. Engage the Bendix
4. Provide voltage to the coil.

One of the best investments you can make for your N is a Battery Tender, or similar float charger. Note: avoid 'trickle chargers'. The main cause of battery failure is the constant discharging and recharging. That will greatly reduce battery life. A Battery Tender will prolong the life span and keep the battery fully charged so it is ready when you need to go to the field. Wally World usually stocks 12V Battery Tenders. My local franchise did not have the 'JR' model, which is their 6V unit, in stock, but I could order one. I found it was cheaper to buy one on line off fleabay, shipping included, for less than WW's pricing.

If you have non-starting issues now, a good strong battery is vital and usually the first step in diagnosing problems. Next would be fuel flow, then spark. Almost 100% of all non-starting problems are due to poor/incorrect wiring regardless if whether they are 6V/POS GRN or 12V/NEG GRN setups so ensure yours is correct.

Tim *PloughNman* Daley(MI)
 

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.

Back
Top