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06-24-2011, 01:16 PM
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#1 |
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Another Day, Another Dollar
Join Date: Nov 2008
Location: North Vancouver, BC
Posts: 1,316
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jumping with 12V
Hey guys,
I don't normally post over here but i have a question: A buddy of mine has a '56? and he tried to jump start it a couple of months ago with a 12V system. He says that it is a 6V system in the truck but he was told that you can jump with 12V if your really quick about pulling the cables. sounds suspect. He says that when he tried to jump the truck he heard a loud POP and now the truck won't start. I haven't actually popped the hood and looked for myself yet but what do you guys think?
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-78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square" 
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06-24-2011, 01:36 PM
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#2 |
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Registered User
Join Date: Jul 2010
Location: Elk River, MN
Posts: 614
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Re: jumping with 12V
A 56 pickup should be 12 volt
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55 2nd series Chevy Pickup 2019 Chevy Equinox(Daily driver) 2011 Chevy Malibu (Wife's car) MSRA Member I went to a bookstore and asked the saleswoman, "Where's the self-help section?" She said if she told me, it would defeat the purpose. -George Carlin |
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06-24-2011, 01:50 PM
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#3 |
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Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,131
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Re: jumping with 12V
I'm not sure what year GMC went to 12 V but they were positive ground until 59. If its a chevy then 56 should have been a 12v already.
Does it not crank or not run?. |
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06-24-2011, 04:55 PM
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#4 |
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Registered User
Join Date: Jun 2006
Location: Idaho
Posts: 8,800
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Re: jumping with 12V
Won't turn over or turns over and will not start? years ago I haD a 6v flathead Ford that occasionaly needed to be boosted and all my friends had 12 v rigs. never hurt the charging or starting system jumping it, but it was a generator. If the 56 is stock it should be a generator too.
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1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project Last edited by OrrieG; 06-24-2011 at 09:00 PM. |
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06-24-2011, 05:00 PM
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#5 |
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Registered User
 
Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,710
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Re: jumping with 12V
If you go + to + and - to - you should be good even if the ground polarity is different.
I'm pretty well positive that that truck should be 12 volt though. On question, why does he believe that the truck is six volt? Last edited by mr48chev; 06-24-2011 at 05:18 PM. |
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06-24-2011, 05:32 PM
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#6 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,237
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Re: jumping with 12V
56 should be a 12v system only thing that would cause a pop is the cables hooked up backwards
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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06-24-2011, 07:02 PM
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#7 |
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Another Day, Another Dollar
Join Date: Nov 2008
Location: North Vancouver, BC
Posts: 1,316
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Re: jumping with 12V
i could be incorrect about the year. what year did gm go to 12v?
__________________
-78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square"
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06-24-2011, 07:57 PM
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#8 | |
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Registered User
Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,710
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Re: jumping with 12V
Quote:
Last edited by mr48chev; 06-24-2011 at 08:02 PM. |
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06-27-2011, 03:24 PM
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#9 |
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Registered User
Join Date: Aug 2008
Location: canada
Posts: 87
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Re: jumping with 12V
chevy 55. gmc 56
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