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#143003 - Sat Jun 18 2005 05:22 PM 56 GMC 1.5 ton: 6 or 12 volt?
tri5trucking Offline
Shop Shark
Registered: Tue May 10 2005 12:00 PM
Posts: 582
Loc: Creswell, Oregon
Hey guys,
I was looking at 56 GMC 1.5 ton with the 6 cyl motor in it. The guy said this truck had a 6 volt system. Does that sound correct? All my 55-57 1.5 and 2 tons are 12 volt.
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#143004 - Sat Jun 18 2005 05:44 PM Re: 56 GMC 1.5 ton: 6 or 12 volt?
OldSub Offline
Cruising in the Passing Lane
Registered: Sun Oct 05 2003 12:00 PM
Posts: 6663
Loc: Seattle, Washington
Should be 12 volt.
_________________________
Its true, I really don't do anything but browse the Internet looking for trouble...
Steve@OldSub.com . www.OldSub.com . www.MaxwellGarage.com . www.OldGasTowRigs.com
'55 1st GMC Suburban . '54 GMC 250 trailer puller project. '54 GMC 250 Hydra-Matic . '54 Chevy 3100 . '47 Chevy COE . and more...
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#143005 - Sat Jun 18 2005 11:09 PM Re: 56 GMC 1.5 ton: 6 or 12 volt?
V6 jimmy Offline
Wrench Fetcher
Registered: Wed Jun 01 2005 12:00 PM
Posts: 248
Loc: arkansas
I think it should be 12 volt BUT GMC did things a little different than chevy sometimes i had a 55 second series 3/4 ton that was 6volt
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#143006 - Sun Jun 19 2005 02:06 AM Re: 56 GMC 1.5 ton: 6 or 12 volt?
GMCpanel Offline
Shop Shark
Registered: Mon Apr 29 2002 12:00 PM
Posts: 2664
Loc: Springfield, MO
It should be a 12v. The last 6v GMCs were the '55.2 I6 models.

Of course, if it has an I6, and was mistitled as a '56 (sometimes they were titled by year of sale, not model year), it could be 6v. Check the body number at the website in my signature.
_________________________
Get a REAL truck, get a GMC! www.oldgmctrucks.com
1954 GMC De Luxe COE
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#143007 - Sun Jun 19 2005 01:19 PM Re: 56 GMC 1.5 ton: 6 or 12 volt?
GLPerry Offline
Extreme Gabster
Registered: Sun Feb 06 2000 12:00 PM
Posts: 2657
Loc: Huntington, IN
I believe GMC held on to 6 volt one more year than Chevy did. Weren't they Positive ground too? Pull a bulb and check the numbers on them. Think a dash bulb of 55 is 6, or back of headlight should say voltage if you pop one out. Generator tag sometimes says? OR color of it means something.
_________________________
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Old Iron Ranch
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49 4400, R and JT MM
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#143008 - Mon Jun 20 2005 01:17 AM Re: 56 GMC 1.5 ton: 6 or 12 volt?
John Larson Offline
Wrench Fetcher
Registered: Sun Sep 07 2003 12:00 PM
Posts: 94
Loc: Olympia, Washington
if it's a 56 and 1 1/2 ton its 12 volt. the medium duty trucks were all supposed to be 12v that year.
_________________________
John

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#143009 - Mon Jun 20 2005 02:45 AM Re: 56 GMC 1.5 ton: 6 or 12 volt?
GMCpanel Offline
Shop Shark
Registered: Mon Apr 29 2002 12:00 PM
Posts: 2664
Loc: Springfield, MO
All 6v GMCs were positive ground. V8 '55.2 GMCs were 12v negative ground.
_________________________
Get a REAL truck, get a GMC! www.oldgmctrucks.com
1954 GMC De Luxe COE
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#143010 - Tue Jun 21 2005 06:00 PM Re: 56 GMC 1.5 ton: 6 or 12 volt?
tri5trucking Offline
Shop Shark
Registered: Tue May 10 2005 12:00 PM
Posts: 582
Loc: Creswell, Oregon
Well it's home and its a 6 volt alright. The fun begins.....
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#143011 - Tue Jun 21 2005 06:26 PM Re: 56 GMC 1.5 ton: 6 or 12 volt?
spanky Offline
Shop Shark
Registered: Fri Dec 20 2002 12:00 PM
Posts: 4108
Loc: burlington, n.c.
How many cells does the battery have. 3 cells = 6 volt, 6 cells = 12v.
_________________________
Spanky Hardy
Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers

1950 GMC 250 1-Ton in the Gallery
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#143012 - Tue Jun 21 2005 06:41 PM Re: 56 GMC 1.5 ton: 6 or 12 volt?
tri5trucking Offline
Shop Shark
Registered: Tue May 10 2005 12:00 PM
Posts: 582
Loc: Creswell, Oregon
It didn't come with a battery but the light bulbs are 6v.
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