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The last of the shows will soon be only digital pictures and fond memories. If you are getting your Bolt ready for some last cruises, or just thinking about putting her up for winter, be sure to check out what parts you need from American Classic Truck Parts. They still offer a 10% discount to Stovebolters.

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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: 589
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
Shop Shark
Registered: Sun Feb 06 2000 12:00 PM
Posts: 2658
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.
_________________________
G.L. Grumpy's
Old Iron Ranch
Huntington, IN 46750


MM R tractor, Speedex
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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: 589
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: 4157
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

1948 Chevrolet 5700 COE Holmes HD W35 Wrecker
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1950 GMC 250 1-Ton
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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: 589
Loc: Creswell, Oregon
It didn't come with a battery but the light bulbs are 6v.
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