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Jump starting a 6v with 12v

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Greg

02-06-2000 18:56:03




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The 9N has a positive ground. My tractor has been sitting out in the cold for a while and the battery is weak. What is the proper way to attach jumpers from 12v to the 6v. I know it can cause problems if left on for too long. Do you put the positive from the 12v to the negative of the 6v if using a vehicle for a jump. I do have a spare 12v battery in the garage that has a full charge. Will it get hooked up differently if I use it because it is not grounded to anything. Thanks.

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Halbert09

02-08-2000 06:19:48




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 Re: jump starting a 6v with 12v in reply to Greg, 02-06-2000 18:56:03  
Zane is correct. Just connect the positive from the jumper battery to any ground point on the 9N, the battery post is ok. Then touch the negative cable to the starter post making sure the tractor is not in gear so you don't get run over. This way only the starter motor gets 12volts and it will spin nice and fast like with a 12Volt conversion. Don't abuse the starter by spinning for a long time with 12v, let it cool off. The full power from the 6volt battery can then power the ignition system. You don't have to worry about any current flowing back thru the starter cable like Bill says because its connected thru an open solenoid or starter switch.This is the safest way but of course assumes that the 6volt battery has enough charge to supply spark.

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BILL(NC)

02-07-2000 05:31:40




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 Re: jump starting a 6v with 12v in reply to Greg, 02-06-2000 18:56:03  
I don't like to belabor a point, but here goes. I have seen a 6V battery blown up and sulferic acid sprayed all over the place when it was jumped with 12V. I suggest removing the hot cable from the 6V battery before you connect the 12V. I estimate that would take no more than an three extra minutes. You may never have a battery blow up on you, but are your eyes worth taking the chance? It's like getting shot with an unloaded gun.

A side benefit from disconnecting the 6V battery first is that when you get the engine started, remove the 12V, and reconnect the 6V, the engine should not quit. If it does, your generator/alternator is not putting out.

One thing about this board that impresses me is that there is a lot of talk about safety. Being a novice at tractoring, it has ment a lot to me.

Bill Malpass

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Elvy

02-07-2000 22:45:48




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 Re: Re: jump starting a 6v with 12v in reply to BILL(NC), 02-07-2000 05:31:40  
If you have a three brush generator with a two terminal, cutout in a round can, DO NOT DISCONNECT THE BATTERY WITH THE ENGINE RUNNING. This forces the entire output of the generator through the field windings and will BURN IT UP in a very short time.

It is NOT GOOD PRACTICE to disconnect a battery with any generator/alternator charging. The voltage reference for the regulator goes away which leads to generator runaway with the same positive smoke test as above.

Elvy

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BILL(NC)

02-08-2000 04:57:22




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 Re: Re: Re: jump starting a 6v with 12v in reply to Elvy, 02-07-2000 22:45:48  
Thanks for setting me srtaight on that. I learn something every day! I still don't think it's a good idea to jump 6V with 12V though.



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BILL(NC)

02-08-2000 04:57:04




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 Re: Re: Re: jump starting a 6v with 12v in reply to Elvy, 02-07-2000 22:45:48  
Thanks for setting me srtaight on that. I learn something every day! I still don't think it's a good idea to jump 6V with 12V though.



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Dave 50 8N

02-08-2000 11:58:20




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 Re: Re: Re: Re: jump starting a 6v with 12v in reply to BILL(NC), 02-08-2000 04:57:04  
I thought battery explosions came from gas above the battery being ignited by a spark, which is why you hook up the second cable away from the battery someplace (the ground in neg ground systems), right?



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ZANE

02-06-2000 19:29:54




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 Re: jump starting a 6v with 12v in reply to Greg, 02-06-2000 18:56:03  
When jump starting an N tractor with 12 volts it not necessary to hook the 12 volts to the 6 volts battery at all. As a matter of fact I strongly reccomend against it.
Instead hook the 12 volts directly to the frame of the tractor for the ground and with the transmission in neutral and out of the way of the wheels of the tractor so you don't get run over touch the other cable from the 12 volt source to the post on the starter.
By doing it this way you don't even have to worry about the polarity of the batterys or which cable you have to ground or positive to the frame or the starter as the 6 volt systme is not intered into at all with the 12 volts. Just turn on the switch and touch the hot cable to the starter post and it will go.

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Bob

02-08-2000 05:17:31




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 Re: Re: jump starting a 6v with 12v in reply to ZANE, 02-06-2000 19:29:54  
Isn't the starter post connected to the negative cable from the 6v battery? If yes, how is this different from connecting the jumper from 12v directly to the 6v battery?



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tOTG

02-06-2000 20:42:00




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 Re: Re: jump starting a 6v with 12v in reply to ZANE, 02-06-2000 19:29:54  
Zane's method will work if your tractor's battery has enough juice to fire the plugs. Otherwise...

John.CO



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STUMP PULLER

02-06-2000 19:01:25




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 Re: jump starting a 6v with 12v in reply to Greg, 02-06-2000 18:56:03  
ALWAYS PLUS TO PLUS MINUS TO MINUS. FOLLOW PROPER JUNPING PROCEDURES. YES IT STRESSES STUFF.



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