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Discussion Starter · #1 ·
As the title reads I've got a 9N with a 6 volt battery. Every time I go to start the tractor which isn't too often, I need to jump it with a 12 volt battery to get it to start. This is even if I supposedly get the 6 volt battery fully charged.
Now realizing the generator likely puts out more than 6 volts when charging, how would it work or not, if I simply put a 12 volt battery in place of the 6 volter? Would it charge to whatever the generator is putting out and thereby hopefully give a better kick to start the tractor? I don't know if a 12 volt battery can be charged to a lower voltage and still have cranking power.
 

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Old Guy With Old Toys
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If it is right it will start on six volts. How long has it been since a tune up, points, plugs, etc? Reproduction wiring sets are cheap. What kind of shape is your wireing in? What size are your battery cables? Many of these old Ns are running with skinny cheap battery cables that just will not carry enough current to do the job. What kind of compression do you have?
 

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Discussion Starter · #3 · (Edited)
Points(Ford branded), distributor cap and rotor, plugs & wires, carb rebuild kit within the last two years or so. Battery is within two years old also. It very well could be the battery cables are undersized and loses juice when it cranks. I hadn't gave that much thought since they're the ones that were on it when I got it. When I last did a compression check the cylinders were in a range of 90-100 if I remember correctly.

Oops, I just noticed there's a forum section for 9N's I should have posted in
 

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You either have to have it as a 6v system or a 12v system. Now if you still have the 6v genny and it is charging your battery there is no need to change to 12v you need to correct the starting problem instead of band aid it with the 12v battery. First make sure you have the BIG THICK battery cables like Raytasch said and also make sure the connections are clean and tight. Also make sure your 6v system is positive ground and that the ground cable is connected to the chassis of the tractor and not to the sheet metal. If it still won't turn over good enough to start then you need to check the starter is not drawing to much current in need of R&R.
 

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Old 'n Cheap
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Replacing the 6v battery with a 12v battery would not work out well unless you do a complete changeover (alternator, coil, resistors, etc). If you jump the 6v with a 12v do not do it battery to battery. Turn the key on and connect the 12v positive to ground and and the negative to the starter. The starter will survive the 12v. The coil, lights and other parts may not.
 

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Replacing the 6v battery with a 12v battery would not work out well unless you do a complete changeover (alternator, coil, resistors, etc). If you jump the 6v with a 12v do not do it battery to battery. Turn the key on and connect the 12v positive to ground and and the negative to the starter. The starter will survive the 12v. The coil, lights and other parts may not.
This method will bypass the starter button safety switch so make sure it is in neutral before connecting the jumpers. I'm not trying to scare you just be careful.

Kirk
 

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Old 'n Cheap
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This method will bypass the starter button safety switch so make sure it is in neutral before connecting the jumpers. I'm not trying to scare you just be careful.

Kirk
OOPS! I should have included that in my post. :fing20:
 
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