Posted by Dellbertt on December 17, 2010 at 10:06:41 from (209.172.21.162):
In Reply to: Jumping 6v? posted by Faster346 on December 16, 2010 at 07:45:59:
I have personally seen a 12v battery blow the top of a 6v battery twice.
Once when I was a teenager my cousin asked me to jump his 6v pickup from my 12v JD saying it would whip it over faster. The 6v pickup battery was located in the floorboard and as soon as I connect to my JD the top blew off his battery and took some of the floor insulation with it. It splattered acid all over the inside of the cab.
The second time was about 5 years ago at a local Labor Day tractor get together at the fairgrounds. A fellow was jumping a 6v H with a 12v M. The H battery blew up the instant the owner touched a cable to it. He left in an ambulance and I never heard how he did.
In both instances it was a direct battery to battery connection.
Now, I used to jump my 6v magneto H all the time from a 12v battery until I got smart enough to have the mag rebuilt then it started on 6v easy. When using the 12v I would disconnect the ground cable from the 6v tractor battery then connect the proper 12v cable to the starter then TOUCH the other cable to ground to engage the starter. As soon as the tractor started I release the ground and then reconnect the tractor battery ground.
Publicly advising someone to direct connect a 12v battery to a 6v battery is the most ridiculous and irresponsible thing I have seen on this forum.
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