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#850795 - Fri May 11 2012 07:22 PM 55 Chevy 6 volt???
BIG CHEVY 3600 Offline
Master Gabster
Registered: Tue Oct 10 2006 12:00 PM
Posts: 5339
Loc: DALLAS/BLANCO TEXAS
A friend of mine (mechanic) just got a classic in for a gentle refurbish. It's a 1955 Thunderbird with only 9,000 original miles. It sat on blocks in a garage all these years. When the owner died his son inherited it and now I believe wants to sell it. It has the original tires and looks like brand new. The owner wanted him to convert ot 12 volts. I was surprised considering my folks had a 56 ford and I'm sure it had 12 volt ignition. Knowing how the big three built their cars based on what the competition was doing, I wonder if Chevy had advanced to 12 volt in 55 causing Ford to follow suit. Just curious... headscratch
_________________________
Jim
Big Chevy's Photobucket pix
FIRST START http://www.youtube.com/watch?v=Fb-4nPArk98

Modern ‘science’: the wonder of a
pre-determined mind…

The ‘baseline belief’ of astronomy:
“Any day now, we’ll pick up a tiny,
coded signal from outer space. Then
we’ll know for certain that there is
intelligence out there, because coded
information does not arise by chance”

The ‘baseline belief’ of biology:
The precisely coded genetic information in
every cell would fill many books…
but we know for certain that no intelligence
could have created life.”


Top
#850799 - Fri May 11 2012 07:41 PM Re: 55 Chevy 6 volt??? [Re: BIG CHEVY 3600]
tclederman Offline
Registered: Tue Sep 18 2001 12:00 PM
Posts: 23336
Loc: Jarvisburg, NC

1955 Chevrolet trucks changed from 6v to 12v when the models changed during that year. GMC trucks stayed standard 6v through all of 1955 (even for the new 1955 Blue Chip trucks).

1955 Chevrolet cars changed to 12v at the beginning of the 1955 model year.

However, this 1955 Thunderbird website says that 1955 6 cylinder Chevrolet cars were 6v and V-8 Chevrolet cars were 12v (while the V-8 Thunderbird in 1955 was 6v).

The 1955 Chevrolet Passenger Car Shop Manual states that a 12v electrical generating system was used on all model cars.
Top
#850804 - Fri May 11 2012 08:17 PM Re: 55 Chevy 6 volt??? [Re: BIG CHEVY 3600]
Hotrod Lincoln Offline
Extreme Gabster
Registered: Mon Feb 23 2004 12:00 PM
Posts: 12877
Loc: Dellrose, TN
55 Fords used a 6V positive ground system. In 56, Ford switched to 12V positive ground, along with Packard, Nash, and a couple of other auto manufacturers and then all the auto manufacturers changed to 12V Negative ground in 1957. This was done to standardize the electrical systems so aftermarket accessory manufacturers could simplify their inventories, among other reasons. Freightliner and a few of the other big truck manufacturers used 12V positive ground until the mid-1960's. The 64 Freightliner I learned to drive after getting out of the Air Force used a 12V + system.
Jerry
_________________________
Matthew 7:6

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#850805 - Fri May 11 2012 08:23 PM Re: 55 Chevy 6 volt??? [Re: tclederman]
Achipmunk Offline
Registered: Tue Dec 11 2001 12:00 PM
Posts: 14999
Loc: Boiling Springs, S. C. 29316
Tim is right on about Chevy being 12 volt. I've owned several 55 and 56 chevy's and never heard of or seen anything in 55 about a 6 volt.

For some reason always I always thought Ford was 6 volt in 55 and went to 12Volt in 56...??

....or maybe I'm confused! I go a little crazy when talking about Fords.
_________________________
1937 Chevy Pickup
1952 Chevy Panel
Pictures in my Photobucket
1950 Chevy Coupe

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile
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#850835 - Fri May 11 2012 10:25 PM Re: 55 Chevy 6 volt??? [Re: Hotrod Lincoln]
BIG CHEVY 3600 Offline
Master Gabster
Registered: Tue Oct 10 2006 12:00 PM
Posts: 5339
Loc: DALLAS/BLANCO TEXAS
Originally Posted By Hotrod Lincoln
55 Fords used a 6V positive ground system. In 56, Ford switched to 12V positive ground, along with Packard, Nash, and a couple of other auto manufacturers and then all the auto manufacturers changed to 12V Negative ground in 1957. This was done to standardize the electrical systems so aftermarket accessory manufacturers could simplify their inventories, among other reasons. Freightliner and a few of the other big truck manufacturers used 12V positive ground until the mid-1960's. The 64 Freightliner I learned to drive after getting out of the Air Force used a 12V + system.
Jerry


I always thought those 2.5 ton trucks carried 24 volt batteries. (2)
_________________________
Jim
Big Chevy's Photobucket pix
FIRST START http://www.youtube.com/watch?v=Fb-4nPArk98

Modern ‘science’: the wonder of a
pre-determined mind…

The ‘baseline belief’ of astronomy:
“Any day now, we’ll pick up a tiny,
coded signal from outer space. Then
we’ll know for certain that there is
intelligence out there, because coded
information does not arise by chance”

The ‘baseline belief’ of biology:
The precisely coded genetic information in
every cell would fill many books…
but we know for certain that no intelligence
could have created life.”


Top
#850838 - Fri May 11 2012 10:36 PM Re: 55 Chevy 6 volt??? [Re: BIG CHEVY 3600]
Hotrod Lincoln Offline
Extreme Gabster
Registered: Mon Feb 23 2004 12:00 PM
Posts: 12877
Loc: Dellrose, TN
Some of the cold-country trucks ran a series-parallel system. They put four 6V batteries in series to put 24 volts to the starter, then reconnected them to two 12V banks for charging and lighting purposes. Freightliner was one of the last holdouts using positive ground electrical systems. We had to be very careful when doing a boost start on rigs from that vintage.

Military trucks ran a 24V system, which made them somewhat compatible with the 28 Volt DC aircraft systems.
Jerry

_________________________
Matthew 7:6

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