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Can I jump start a 6/8 volt battery using 12 volt
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Sandknob View Drop Down
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Joined: 12 Sep 2009
Location: Oblong, IL
Points: 2456 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Sandknob Quote  Post ReplyReply Direct Link To This Post Topic: Can I jump start a 6/8 volt battery using 12 volt
    Posted: 25 May 2010 at 12:42pm
Will I have any problems if I try to jump start a tractor with 6 volt system/8 volt battery using my pickup which is 12 volt.  I realize that the tractor is positive ground.
Thanks
Adam
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Matt MN View Drop Down
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Joined: 14 Sep 2009
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Points: 1491 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Matt MN Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2010 at 12:46pm
I have done it before, Dont matter if it is positive ground or negative ground Just match the +/- up on the battery to battery. make sure lights are off. there is a slight chance of burning the points though.
Unless your are the lead horse the scenery never changes!!
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Joined: 12 Apr 2010
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Points: 5816 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DaveKamp Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2010 at 12:49pm
Boy, I certainly wouldn't do it for long.

Realize, that if your original battery is a 6v unit, when you crank it, voltage will drop to around 4.5v... and you'll be connecting a 13.8v supply across it... the differential being 9.3v... that'll put  lots of current flow between the batteries.  it will work, but risks an explosion.  Also puts your pickup at risk of damage, so be extra careful.
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Joined: 08 Nov 2009
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Points: 1034 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ToddSin NY Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2010 at 1:19pm
What about taking a cable off the pickup post before hooking it to the tractor? This wouls isolate the truck from any problems. When you get the tractor running rehook the pickup cable.
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CTuckerNWIL View Drop Down
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Joined: 11 Sep 2009
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Points: 22823 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CTuckerNWIL Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2010 at 4:37pm
I've done it but leave the jumping vehicle shut off.
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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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mdm1 View Drop Down
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Joined: 12 Sep 2009
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Points: 2644 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mdm1 Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2010 at 4:51pm

Put the tractor in neutral turn on the key, place one cable on the starter stud. Then ground the other cable to the frame. The starter doesn't care if it is 6 or 12v. I have not tried this but it comes from another forum and should work. Just don't run the starter for a long time. Good Luck Mike
Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK!
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Joined: 11 Sep 2009
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Points: 22823 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CTuckerNWIL Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2010 at 5:02pm
Just be sure to hook Positive to Positive and Negative to negative and don't let the vehicles touch each other.
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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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M Diesel View Drop Down
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Joined: 26 Feb 2010
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Points: 128 		Post Options Post Options   Thanks (0) Thanks(0)   Quote M Diesel Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2010 at 5:24pm
Originally posted by mdm1 mdm1 wrote:

Put the tractor in neutral turn on the key, place one cable on the starter stud. Then ground the other cable to the frame. The starter doesn't care if it is 6 or 12v. I have not tried this but it comes from another forum and should work. Just don't run the starter for a long time. Good Luck Mike


If you have to do it, that is the best way. Try to stay off the stud threads of course. Keeps from burning out the truck alternator or popping a battery. They make a mess when that happens, and not the fun kind.
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Brian Jasper co. Ia View Drop Down
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Joined: 11 Sep 2009
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Points: 10508 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian Jasper co. Ia Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2010 at 8:47pm
I used to do it all the time with my CA until I found out about the heavier cable requirement for 6V. Just match polarity and make the last connection away from the battery. I never had the pickup running, never needed to. Never had any electrical problems either.
"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Joined: 05 Nov 2009
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Points: 186 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tricky Dickie Quote  Post ReplyReply Direct Link To This Post Posted: 26 May 2010 at 2:47pm
Simply take the tractor terminal connections off the 6/8 volt battery and attach the jump leads to them. By doing this  you will not involve the 6/8 volt battery with the 12 volt current from your pickup truck. When the engine starts, detach the jump leads and reconnect the 6/8 volt battery to the tractor. Make sense, doesn't it?
 
Tricky Dickie
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CTuckerNWIL View Drop Down
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Joined: 11 Sep 2009
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Points: 22823 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CTuckerNWIL Quote  Post ReplyReply Direct Link To This Post Posted: 26 May 2010 at 4:24pm
Tricky, that might not work so good if a guy has a distributor instead of a MAg.
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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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Sandknob View Drop Down
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Joined: 12 Sep 2009
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Points: 2456 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Sandknob Quote  Post ReplyReply Direct Link To This Post Posted: 26 May 2010 at 4:26pm
Thanks guys,
I ended up putting a 12 volt battery in it and a 12 volt coil and disconnected the genny.  Got it to start and now it runs good.
Thanks again
Adam
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