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#143003 - Sat Jun 18 2005 10:22 PM 56 GMC 1.5 ton: 6 or 12 volt?  
tri5trucking  Offline
Shop Shark
Joined: May 2005
Posts: 589
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.



#143004 - Sat Jun 18 2005 10:44 PM Re: 56 GMC 1.5 ton: 6 or 12 volt?  
OldSub  Offline
Cruising in the Passing Lane
Joined: Oct 2003
Posts: 6,663
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...

#143005 - Sun Jun 19 2005 04:09 AM Re: 56 GMC 1.5 ton: 6 or 12 volt?  
V6 jimmy  Offline
Wrench Fetcher
Joined: Jun 2005
Posts: 248
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


#143006 - Sun Jun 19 2005 07:06 AM Re: 56 GMC 1.5 ton: 6 or 12 volt?  
GMCpanel  Offline
Shop Shark
Joined: Apr 2002
Posts: 2,664
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

#143007 - Sun Jun 19 2005 06:19 PM Re: 56 GMC 1.5 ton: 6 or 12 volt?  
GLPerry  Offline
Shop Shark
Joined: Feb 2000
Posts: 2,658
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
and Power King tractors

#143008 - Mon Jun 20 2005 06:17 AM Re: 56 GMC 1.5 ton: 6 or 12 volt?  
John Larson  Offline
Wrench Fetcher
Joined: Sep 2003
Posts: 94
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


#143009 - Mon Jun 20 2005 07:45 AM Re: 56 GMC 1.5 ton: 6 or 12 volt?  
GMCpanel  Offline
Shop Shark
Joined: Apr 2002
Posts: 2,664
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

#143010 - Tue Jun 21 2005 11:00 PM Re: 56 GMC 1.5 ton: 6 or 12 volt?  
tri5trucking  Offline
Shop Shark
Joined: May 2005
Posts: 589
Creswell, Oregon
Well it's home and its a 6 volt alright. The fun begins.....


#143011 - Tue Jun 21 2005 11:26 PM Re: 56 GMC 1.5 ton: 6 or 12 volt?  
spanky  Offline
Shop Shark
Joined: Dec 2002
Posts: 4,188
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
In the Stovebolt Gallery
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1950 GMC 250 1-Ton
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#143012 - Tue Jun 21 2005 11:41 PM Re: 56 GMC 1.5 ton: 6 or 12 volt?  
tri5trucking  Offline
Shop Shark
Joined: May 2005
Posts: 589
Creswell, Oregon
It didn't come with a battery but the light bulbs are 6v.


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