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Jump Starting 6 volt with 12 volts

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Ronald Vogt

01-16-2004 12:25:02

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On very cold days I have to jump start my Farmall 350 6 volt tractor using a 12 vol battery. This works very well. However, will this "fry" the regulator or generator?

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dick

01-16-2004 18:49:53

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Re: Jump Starting 6 volt with 12 volts in reply to Ronald Vogt, 01-16-2004 12:25:02

Read the post by DaveinKY for the way to do this without posing an electrical hazard. The method he describes puts 12 volts across the starter ONLY, so it poses no hazard to the tractor's battery, light, generator, regulator, etc. It also puts the full output of the tractor's battery across the ignition system, rather than drawing it down to run the starter. And don't worry about the starter as long as you don't get too crazy - the old 6 volt starters will handle 12 volts OK.

DO be careful, especially if you're not going to be sitting in the tractor's seat while doing this. Make SURE the tractor is in neutral for heavens sake, and don't get between it and a wall (or whatever).

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Chad Yelland

01-17-2004 08:51:55

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Re: Re: Jump Starting 6 volt with 12 volts in reply to dick, 01-16-2004 18:49:53

i agree with most of you guys, i remove the 6v compleatly from the circut and if your generator work at all or it fitted with a mag, the engine will stay running and you just reinstall the 6v and let the gen charge it up, anyone see a problem with this? allso i'm from canada so i say if you can't start it with the crank you shouldn't be starting it at all, get a block heater!

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Brad L

01-16-2004 19:08:17

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Re: Re: Jump Starting 6 volt with 12 volts in reply to dick, 01-16-2004 18:49:53

Jumping a 6 volt system with 12 volt is always risky. Even if you make your final connection at the frame.When you hook to the frame that spark may not ignite a battery but you can still get a small spark at the other connectors.Once you get 12 to 6 volt battery you get high charge current and produce hydrogen gas faster and it can get worse if the battery is frozen and builds up a pocket of gas inside. I saw a battery explode after we quick charged it at a high rate,we unmooked the charger and the battery blew when we hit the key. It was probably frozen . Point being be careful and if you must do this try to cover your face and eyes because when they go they go with extreme force.

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Mark in AB

01-16-2004 15:58:06

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Re: Jump Starting 6 volt with 12 volts in reply to Ronald Vogt, 01-16-2004 12:25:02

See the topic "What gear do you use for pull starting".

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not an idiot

01-16-2004 16:00:10

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Re: Re: Jump Starting 6 volt with 12 volts in reply to Mark in AB, 01-16-2004 15:58:06

With this amount of brainpower reverse should work just fine!

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not an idiot

01-16-2004 15:48:09

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Re: Jump Starting 6 volt with 12 volts in reply to Ronald Vogt, 01-16-2004 12:25:02

Is starting your tractor worth going blind, being burned by acid, or otherwise getting seriously injured when your battery explodes?

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Jeff

01-16-2004 15:01:06

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Re: Jump Starting 6 volt with 12 volts in reply to Ronald Vogt, 01-16-2004 12:25:02

I recently tried this same thing on my 6v H. The top of the battery blew off about the same time I was disconnecting the leads from the 6V battery. The 6V was new. I don't know what all I did wrong but I know I won't try it again!

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lee

01-16-2004 21:10:22

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Re: Re: Jump Starting 6 volt with 12 volts in reply to Jeff, 01-16-2004 15:01:06

One thing to watch out for is that hydrogen gas
mixed with oxygen in the air is very explosive. Hydrogen gas is produced when a battery is charging. If you remove a battery cap while charging the bubbles you see are hydrogen gas. Any time you charge or jump a battery there is potential for sparks to ignite the hydrogen/oxygen mixture. That's why they tell you to make the final gouund connection at the frame or some place other than the battery post away from the battery. Sparks at the post have potential to ignite the mixture. A 6 volt battery hooked to a 12 Volt will be generating large amounts of hydrogen gas in a hurry. The battery will get very hot, very quickly. It may explode with the spark when you disconnect or it may simply blow due to internal
heat build-up or internal short.

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lee

01-16-2004 15:52:07

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Re: Re: Jump Starting 6 volt with 12 volts in reply to Jeff, 01-16-2004 15:01:06

This is generally what will happen. You are pumping a huge current thru the 6 volt battery when you connect it to a 12 volt battery. It will heat up and blow.

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Farmallkid

01-16-2004 14:20:59

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Re: Jump Starting 6 volt with 12 volts in reply to Ronald Vogt, 01-16-2004 12:25:02

We did this with dads truck at grandmas a couple years ago, my m hadn't run for 5 years and we thuoght we should get er goin.Well, We blew the lights, maybe it would not have happened if the lights were off.And we had some smoke comin off the battery.Now we inherited the tractors from grandpa and have them home, I use the fast start on the charger.

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Bob M

01-16-2004 13:33:25

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Re: Jump Starting 6 volt with 12 volts in reply to Ronald Vogt, 01-16-2004 12:25:02

So long as you don't let the motor on the 6 volt tractor run up fast enough to cause the generator to try to charge the battery after the engine fires, jumping with 12 volts will cause no harm. Been doing it myself for years.

However as the others warn BE CAREFUL!! Make the final jumper cable connection to a frame ground as far as possible from both batteries. (Hasn't happened to me but I know others who've had a battery explode when jumping...) Employ an assistant to keep jumper the connection as brief as possible - make the connection just before you begin to crank and disconnect the instant the engine fires (or the instant you quit cranking). Don't crank too long! If the motor doesn't fire in a few seconds STOP, and determine why. A 6 volt starter will not survive a long grind on 12 volts!

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49 Cubber!

01-16-2004 12:38:22

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Re: Jump Starting 6 volt with 12 volts in reply to Ronald Vogt, 01-16-2004 12:25:02

If your hooking it battery to battery,Im surprised you havent blown something up already.If your just hooking it to the starter post and ground,your fine!

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lee

01-16-2004 12:27:51

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Re: Jump Starting 6 volt with 12 volts in reply to Ronald Vogt, 01-16-2004 12:25:02

This has potential to blow the 6 volt. Not a good thing to do. Be careful.

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DaveinKY

01-16-2004 16:15:30

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Re: Re: Jump Starting 6 volt with 12 volts in reply to lee, 01-16-2004 12:27:51

I'm with the "cubber". If you remember the principal of positive (+) to positive (+) and neg to neg (-) and connect postive from 12V to the starter post and touch the negative from the 12V to the frame of the 6V tractor, you are only running 12V through the starter and not the battery or charging system. Hold it only long enough for a few revolutions then check to see why it hasn't started (forgot to turn the gas on?). Don't overheat the starter and you can do this without a headache. Have a happy winter!

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lee

01-16-2004 20:49:22

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Re: Re: Re: Jump Starting 6 volt with 12 volts in reply to DaveinKY, 01-16-2004 16:15:30

This will work if it has a separate starting solenoid but if it is an old starter with a mechanical starting switch mounted on the starter the starter post goes direct to the battery. You can crank a 6 volt starter with a 12 volt battery as long as you don't crank too long but make sure the 6 volt battery is not in the circuit.

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04terry

01-16-2004 18:11:58

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Re: Re: Re: Jump Starting 6 volt with 12 volts in reply to DaveinKY, 01-16-2004 16:15:30

I spose you have to reverse the procedure if it is positive ground, right?

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