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Tractor Talk Discussion Forum

12V starting for a 6V system

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John Fila

03-12-2006 14:07:09




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Just finishing up repairs on my old Massey Harris Mustang and I know I will have trouble starting her. Is it safe to use a 12 volt battery to jump start this 6 volt sytem? I know I did this years ago using jump cables but just for a few seconds. This time I might have to crank a while? Any help is greatly appreciated.
John




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phil(va)

03-13-2006 04:14:26




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 Re: 12V starting for a 6V system in reply to John Fila, 03-12-2006 14:07:09  
Hook 12 v directly to starter post and to ground on tractor. Don"t hook to 6 v battery. Be sure tractor is out of gear!!! If key is on, starter will turn fast and she will start if no other problems.



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russ1

03-12-2006 17:05:42




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 Re: 12V starting for a 6V system in reply to John Fila, 03-12-2006 14:07:09  
12 volts will not hurt the starter. I restore cars and tractors and in 12 volt conversions I never replace the starter. I like the ease with which they crank on 12 volts. Your battery and the rest of the system is a different story and cannot tolerate 12 volts.



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Rod in Smiths Falls, ON,

03-12-2006 14:56:07




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 Re: 12V starting for a 6V system in reply to John Fila, 03-12-2006 14:07:09  
Don't run the starter for longer than 15 seconds a session.



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Coloken

03-12-2006 14:19:45




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 Re: 12V starting for a 6V system in reply to John Fila, 03-12-2006 14:07:09  
Don't hook a 12 volt across a 6 volt battery. Things get hot fast and the 6 volt may blow. Just use the 12 volt to start it. Leave the 6 volt out of it. Having said that, I have jumped a 12 volt to a 6 volt many times while the starter is running. I am counting on small booster cables reducing the voltage. A 2 person thing.



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John Fila

03-12-2006 15:01:24




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 Re: 12V starting for a 6V system in reply to Coloken, 03-12-2006 14:19:45  
Thanks for the reply. Do you mean I should take the 6v battery right out of the circuit? When it starts do I then disconnect the 12 and put the 6 back in? Won't she stall without any battery? Otherwise I don't understand how I can hook up the 12 without connecting it to the 6. Or do you mean one guy starts her using the 6 and while cranking another guy jumps the 12 to her? Thanks again for any help.
John

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souNdguy

03-13-2006 12:07:41




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 Re: 12V starting for a 6V system in reply to John Fila, 03-12-2006 15:01:24  
No..no.. no..

leave the charged 6v battery where it is.. turn ignition to on. then use the 12vbattery, with good jumper cables, and jump directly to the starter.. etc.. as soon as you hook up the last cable.. the starter spins... I'd block the clutch to help with load, and do make sure tranny is in neutral...

Soundguy



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Coloken

03-12-2006 16:31:43




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 Re: 12V starting for a 6V system in reply to John Fila, 03-12-2006 15:01:24  
Richard and Don got it. 6 volt like it is--run starter, have some one on groung hold hot 12 volt to starter connection. Short time only, then go get a pull.



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Richard H.

03-12-2006 15:30:47




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 Re: 12V starting for a 6V system in reply to John Fila, 03-12-2006 15:01:24  
Don"t hook the jumpers to the Battery! While you are trying to start it, touch the hot cable directly to the srarter post on the starter with your 12 volt. Your charging system will not get along with 12v. going across your 6v battery and regulator.



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Don L C

03-12-2006 15:19:24




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 Re: 12V starting for a 6V system in reply to John Fila, 03-12-2006 15:01:24  
Hello John ---leave the 6v system and 6v battery as they are.....be sure the lights are turned off as they cant take the 12v....connect the 12v up to the 6v battery, make your last conection to the neg.post of 12v battery.....continue to start your tractor as you always have.....except only short cranking on starter....count to 10 then stop after 3 tries feel starter motor, see if it is warm ,ok -- hot stop....look for reason engine is not starting....good luck..... ..Don

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