According to my Farmall operators manual, to protect some of the electrical components on the tractor, when hand cranking and running on the magneto, there is a wire on the generator that should be disconnected since the charge has no place to go in the absence of a battery. Question is if a battery is in place even though it is completely dead is it okay to run on the magneto without disconnecting any wires? Will anything be harmed?
- Thread starter 45JDB
- Start date
gene bender
Well-known Member
Read again as the magneto is not connected to any voltage source. The wire from the sw is to ground and never put any volts from a battery or generator to the mag.
Nebraska Cowman
Well-known Member
The electricity from the generator will go into the dead battery. Note it says "absence" of battery.
armand tatro
Well-known Member
This is the 21 first century. Why not install a new battery and hang the crank on the wall where it belongs??? Armand
Aaron SEIA
Well-known Member
I'm trying to figure out why you'd have a generator and no battery? Are they thinking you took it out to put in the Model T? As others have said, mag doesn't hook to any electrical system.
AaronSEIA
AaronSEIA
old
Well-known Member
- Location
- Camdenton Missouri
Yep just leave the dead battery in or hook up a light so the generator does in fact have a place to dump its power to and also leave the battery there
If you really have a Magneto, it has no connection to any battery or generator or charging system whatsoever. It dont know or care or have anything to do with any battery or generator. On some tractors with magnetos there may be some sort of "kill switch" which grounds out the points if in the OFF/Stop position but thats simply a circuit from the magnetos points to frame ground when OFF while that circuit is open when ON/Run. The magneto porduces its own electrical energy by its turning INDEPENDANT form any battery or generator etc
John T
John T
Russ from MN
Well-known Member
- Location
- Bemidji MN
I would take the battery out before it freezes and leaks acid on the tractor, and sell it for scrap! Then take the belt off the generator or unhook the wire. I crank start our C once in a while just because it starts so well.
I live in North Alabama and freezing isn"t really an issue until maybe February. The reason I don"t just unhook the wire is because this is a 1948 cub and in order to access the gen and voltage reg the entire gas tank/hood assembly would have to come off. What a pain in the but. The later models relocated the gen for easier access. I think just leaving the old battery in place so that is someplace for the charge from the gen to go to will work like "OLD" said.
old
Well-known Member
- Location
- Camdenton Missouri
Your simply wanting to run your cub and since it has a mag the battery is just there to take up the volts of the generator. You do not mind starting it by hand since I do not use it much any how. Just to be on the safe side a 6 volt light will help keep you from hurting the generator just in case the battery has a shorted out cell in it
old
Well-known Member
- Location
- Camdenton Missouri
John his worry is that he will fry the generator system if it has no battery in place o take up the power produced by it when it is running. He understands that a mag is independent for the generator system he just wants to protect the generator system when he runs this tractor nothing more
Thanks Rich, nope a genny dont fry if its spinning with no load attached as theres no current being drawn. The open unloaded voltage will rise higher then if its attached to a battery of course. At our local genny shops they put them on a rig and spin them and theres sure no battery attached when they do that. Then they do apply a load and measure the voltage and current production to see if the genny is producing energy.
Keep dry down there
John T
Keep dry down there
John T
old
Well-known Member
- Location
- Camdenton Missouri
Heck no I do not want to keep dry or should I say I do not want it to stay dry out side. LOL. As I told him just leave to old battery in place and he will be just fine and if he wants to be double sure just hook up a simple light to it and then he knows the system works. O am and never will be a fan of open circuit running of things even if in theory it will not hurt any thing but if he some how got across the battery cables it sure could hurt him at least again in theory
Disconnect the Field wire from the "F" terminal on the generator, this will prevent the generator from producing any voltage. I remember reading in the old JD 2 cyl operators manual that if you ran your tractor without a battery, to remove the field wire from the generator.
A 6V generator run without a load, will produce near 100 volts, which will quickly overheat and burn up the armature and field coils.
Also, as the others state, get that junk battery out of there before it leaks and destroys the battery box.
A 6V generator run without a load, will produce near 100 volts, which will quickly overheat and burn up the armature and field coils.
Also, as the others state, get that junk battery out of there before it leaks and destroys the battery box.
Not really, if the battery has a shorted cell, it will overload / overheat the generator and burn it out. If the battery is so bad that it puts no load on the generator, it will allow generator voltage to rise high enough to overheat the fields and armature, burning them out.
Remove the field wire so the generator can not charge.
Remove the field wire so the generator can not charge.
If the field post isnt connected to anything theres no Field current so the only magnetic field strength is the low residual magnetic strength in the iron field poles so the gennys output is very low. The output voltage is present across the armature i.e. the gennys ARM post and case/frame but if theres no load connected theres no current flow.
Hope this helps
John T
Hope this helps
John T
old
Well-known Member
- Location
- Camdenton Missouri
Well in theory it could kill since all it takes as was taught in the Navy 1 milli amp to kill at almost no volts. Almost got wrote up because I had put my fingers on both posts of a 12 volt battery and was told in the right conditions it could have killed me
Ultradog MN
Well-known Member
- Location
- Twin Cities
Lot of nanny staters will jump on you for hand cranking your engine.
As a kid our Allis B and Case DC3 would never start with a battery so I got used to hand cranking them every time I used them.
It's very satisfying to hear an engine roar to life - practically right in your hands.
As a kid our Allis B and Case DC3 would never start with a battery so I got used to hand cranking them every time I used them.
It's very satisfying to hear an engine roar to life - practically right in your hands.
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