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year of 6 volt to 12 volt conversion from factory?
#877815 Sun Aug 26 2012 12:28 PM
Joined: Mar 2012
Posts: 170
B
Shop Shark
I know the AD trucks were built using 6 volt systems. But I was curious what year did Chevrolet (or other companies either)start to use 12 volt electrical systems in their trucks as built from the factory? Brian

Re: year of 6 volt to 12 volt conversion from factory?
Brian_Ostner #877824 Sun Aug 26 2012 01:27 PM
Joined: Feb 2004
Posts: 19,910
H
Boltergeist
The 2nd.-generation 1955 Chevy trucks made the switch to 12 volts. I'm not sure when GMC swapped over, nor whether they kept the positive ground system for awhile after the switch to 12V. I don't think so. By 1957, all the major auto manufacturers had standardized electrical systems at 12V negative ground at the urging of aftermarket electrical accessory manufacturers. Freightliner big trucks hung onto the 12V + ground system until the mid-1960's.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: year of 6 volt to 12 volt conversion from factory?
Hotrod Lincoln #877855 Sun Aug 26 2012 03:56 PM
Joined: Sep 2001
Posts: 29,544
ace skiver
GMC went through all of 1955 with standard 6v positive ground on small trucks. Large GMC trucks switched to standard 12v (neg ground) in late 1955 (Blue Chip GMC).

All GMC trucks were 12v negative ground in 1956.


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE [1954advance-design.com] - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: year of 6 volt to 12 volt conversion from factory?
tclederman #878257 Mon Aug 27 2012 09:40 PM
Joined: Mar 2002
Posts: 8,950
Master Gabster
As an interesting aside, I have a set of GM instructions for converting a truck to 12 volts. I think it was published for the year 1949. It was mainly to provide better starting in the winter.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: year of 6 volt to 12 volt conversion from factory?
truckernix #883107 Sun Sep 16 2012 08:29 PM
Joined: Apr 2011
Posts: 181
1
Wrench Fetcher
I have a first series '55 3100 and it came with a 235 six and twelve volt system. My buddy has a '54 (they look identical) and his has a 6 volt system. A close friend has a '56 Fiord and it is 12 volt. I know the '55 Fords were 6 volt. So maybe 1956 was the changeover for some and others did it in '55?
Normbc9

Re: year of 6 volt to 12 volt conversion from factory?
123456789101112 #883113 Sun Sep 16 2012 08:47 PM
Joined: Mar 2005
Posts: 1,700
R
Shop Shark
The 55 1st series truck would have been 6 volt. The 55 2nd series truck would have been 12 volt.

Don't know about the Fords.

Re: year of 6 volt to 12 volt conversion from factory?
Roy Rodgers #883225 Mon Sep 17 2012 08:56 AM
Joined: Aug 2005
Posts: 8,878
Global Mod
Agreed. If your 55.1 had 12v when you bought it someone ahead of you converted it.

Last edited by Tiny; Mon Sep 17 2012 08:56 AM.

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Re: year of 6 volt to 12 volt conversion from factory?
Tiny #883270 Mon Sep 17 2012 02:04 PM
Joined: May 2001
Posts: 8,386
Extreme Gabster
Exception to the rule: 1955 GMCs with 6 cylinder were 6V in both series.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
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Re: year of 6 volt to 12 volt conversion from factory?
Cletis #883363 Mon Sep 17 2012 09:05 PM
Joined: Sep 2001
Posts: 29,544
ace skiver
Originally Posted by cletis
Exception to the rule: 1955 GMCs with 6 cylinder were 6V in both series.

Big 1955 Blue Chip GMC trucks, 550-650 series "big trucks" were standard 12v. It is interesting to note that models 100-410 GMC V-8s were 12v, with some of the larger models having optional two/dual 12-v batteries.


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE [1954advance-design.com] - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: year of 6 volt to 12 volt conversion from factory?
tclederman #883587 Tue Sep 18 2012 11:45 PM
Joined: Feb 2004
Posts: 19,910
H
Boltergeist
Ford switched to 12V in 1956, but it was a positive ground system. All auto manufacturers standardized at 12V negative ground in 57, but a few oddball big trucks like Freightliner kept the positive ground system through the mid-1960's. Nash and Packard, and possibly Studebaker also ran 12V positive ground systems for a short time prior to 1957. 6 volt MOPAR cars and trucks were positive ground until 55 or so.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

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