Mon Feb 23, 2015 10:45 am
Can anyone suggest a safe way to jump start a 6 volt system with a 12 volt system.
Mon Feb 23, 2015 10:59 am
No. You will get several suggestions and some are more safe than others. But none of them are really safe. Any connection that feeds 12 volts into a 6-volt battery is risky. If you can connect 12 volts to the starter while keeping it isolated from the 6-volt battery, the hazards are greatly reduced. Unfortunately, with the starter switch mounted directly on the Cub starter, you can can't isolate from the installed battery without some disassembly.
Now with that said, people frequently use 12 volts and jump directly to the large terminal on the starter switch and get away with it.
Mon Feb 23, 2015 11:04 am
As an addition to Jim's comments, make sure polarity is correct, remember, original 6 volt was + to ground originally, but if not sure check the battery connection. When ready connect source directly to frame and starter, to keep sparks away from battery. As soon as engine starts to fire remove 12 volt jumper. Don't forget, that while doing this the 12 volts is also feeding back toward the 6 volt battery, so leaving it very long can result in overcharging damage to the battery.
Mon Feb 23, 2015 12:39 pm
It's not a safe thing to do and feed 12-v into 6-v system can do harm to ignition system,--IF it's a battery system!---I have did it a couple times in emergency case, BUT not something I would recommend others try! thanks; sonny
Mon Feb 23, 2015 1:21 pm
Never safe to jump 6 to 12. I have myself blown up a few 6 volt batterys while jumping with 12. And if your using a veheicle with a computer to jump a 6 volt system you may fry the computer or at a minimum the alternator. . Best thing to do is remove the 6 volt battery then install the 12 volt. get the tractor running. if the charging system is working correctly you can remove the 12 volt while the engine is running and install the 6 volt.
Mon Feb 23, 2015 7:28 pm
Thanks for all feed back. Can a 6 volt charger be bought? What does everyone do when they have a dead battery on a 6 volt system?
Mon Feb 23, 2015 8:44 pm
Most chargers handle 6 or 12 volts. Some have a selector switch. Some have an automatic control that charges based on the voltage detected when you hook it to the battery. Several of us have small battery maintainers to keep the battery topped off when the tractor is parked. WalMart has some made by Schumacher that run in the $20 to $25 range.
Tue Feb 24, 2015 8:36 am
Not a real good idea but I will admit to having done it. Hook to the 6 volt first and then to the twelve. I use the cadet for the power source since it has a lot less amperage than a car. Whether or not that makes a difference may be wishful thinking. The best would be to charge the 6 of course but impatience you know. If you have power but never seems like quite enough consider a second 6 volt hooked parallel. A pricey solution but the increased amps will spin it better. Vern
Tue Feb 24, 2015 3:34 pm
I have a big Shumaker charger.--works on 12-v and on 6-v, it has a engine boost position to use in either 12-v or 6-v.---this is what I use mostly and this charger is a old model and still going.---so that's another option.---a cheaper model is around a hundred bucks or so but well worth it.--I bought 2 of the newer ones on auction for $60. each, so shop around! thanks; sonny
Tue Feb 24, 2015 5:02 pm
I bought a schumacher compact (bench top ) charger for 6 or 12 volt at walmart for around 50 bucks, if I remember correctly
Tue Feb 24, 2015 6:07 pm
If you are not in a hurry to charge, I would recommend the Schumacher tender from Wal-Mart. I have one and found out that it is actually designed to act as a desulfator as well. Before I bought it, I could not charge my battery above about 80 percent charge. After leaving it on the tender for a week, I can now charge it up to 100% again.
If you need to be able to charge batteries more quickly, I can recommend the Sears chargers. I bougt one a few years back that charges at 2, 12, or 30 amps for either 6v or 12v. It has a selector switch, which I prefer, because then I know it is charging at the correct voltage. It also has a jump function, plus you can set to let you know either the charging voltage or the percent of charge, and it has a setting for testing alternator output.
Tue Feb 24, 2015 6:37 pm
Restoring 1948 Cub. Looking at manuals for electrical diagram.
Tue Feb 24, 2015 7:38 pm
Thanks for all of the reply's and great information. I will get a charger. New to the cub world. I was given two tractors both are in good shape so this is a new project(s) for me.
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