Classic Parts Talk  

Go Back   Classic Parts Talk > Chevy & GMC Trucks by Year > 1947-1954

1947-1954 Discuss all aspects of your 1947-1954 Chevy or GMC Pickup

Reply
 
Thread Tools Search this Thread Display Modes
Old 11-03-2010, 12:11 AM   #1
skiter1961
Registered User
 
Join Date: Jul. 28, 2010
Location: California
Posts: 40
ignition ballast resistors

when converting from 6 volt system to 12 volt system why is the ingition ballast resistor required. ( or is it not) on chevy truck 1950 thanks for the help
skiter1961 is offline   Reply With Quote
Old 11-03-2010, 12:49 AM   #2
ccharr
Registered User
 
ccharr's Avatar
 
Join Date: Jun. 7, 2006
Location: Simi Valley, Ca. , La Paz County, Az.
Posts: 1,992
Quote:
Originally Posted by skiter1961 View Post
when converting from 6 volt system to 12 volt system why is the ingition ballast resistor required. ( or is it not) on chevy truck 1950 thanks for the help
all I can tell you is this; when I went from 6 to 12 volt the people at the parts house I used gave me a coil without the internal resistor and I got about 6 miles out of the truck before it back fired so bad it would not run but blow a 9 inch rip open in my muffler. The is the reason I have the petronic system and the flame thrower coil that pairs up with it. Vehicle electrical I understand Not. But My truck runs, and that is all that matters.
So if you have a muffler then that is the reason the resistor is required so you keep them on the truck. Hope this helped, it caused a frown for me remembering the cost to replace the damn muffler because some learning parts person forgot to give me a coil with an a internal resistor.
__________________
Charles
'48 3804 Registered as
a '47 w/h 9 ft. bed,
'52 3804 w/h 9ft. bed,
'56 CJ5
'60 CJ5
Misc. Tractors
ccharr is offline   Reply With Quote
Old 11-03-2010, 06:31 AM   #3
ol' chebby
Registered User
 
ol' chebby's Avatar
 
Join Date: Dec. 11, 2007
Location: Charlotte,NC
Posts: 3,080
Send a message via AIM to ol' chebby
NAPA IC64 coil has the internal resistor. Pertronics is THE way to go. If you go pertronics, get one of their flame thrower coils also.
__________________
I'll paint anything that will stand still long enough!
WWW.rpettycustommurals.com

Advance Design Rescue...Bringin' 'em back, one body at a time.
ol' chebby is offline   Reply With Quote
Old 11-03-2010, 12:17 PM   #4
bigtimjamestown
Registered User
 
bigtimjamestown's Avatar
 
Join Date: Jan. 11, 2010
Location: Jamestown Ca.
Posts: 677
Send a message via Yahoo to bigtimjamestown
Quote:
Originally Posted by skiter1961 View Post
when converting from 6 volt system to 12 volt system why is the ingition ballast resistor required. ( or is it not) on chevy truck 1950 thanks for the help
You need a ballast resistor because points can only handle 9 volts that's why the resistor drops the voltage from 12 to 9 volts. Any more voltage than that will burn up a set of points. An internally ballast coil will eliminate the need for a ballast resister. Also if you use a MSD box you will not need a ballast because the points only trigger the box and the box does the rest....Big Tim
__________________
bigtimjamestown is offline   Reply With Quote
Old 11-04-2010, 08:59 AM   #5
vwnate1
Registered User
 
vwnate1's Avatar
 
Join Date: Jan. 1, 2000
Location: AMERICA !
Posts: 9,917
Post To Further Define this :

A ballast resisted ignition coil should _only_ be used in conjunction with a by - pass circuit so as to improve cold weather starting , 99-44/100 % of the time , this means solenoid operated starters only .

Accell also makes good , high output ignition coils .

they're FUGLY yellow though .
__________________
-Nate

' PASSION ' :

There are many things in life that will capture your eye , very few will capture your heart ~ those are the ones to persue .

Those are the ones worth keeping .
vwnate1 is offline   Reply With Quote
Old 11-04-2010, 11:24 AM   #6
bigtimjamestown
Registered User
 
bigtimjamestown's Avatar
 
Join Date: Jan. 11, 2010
Location: Jamestown Ca.
Posts: 677
Send a message via Yahoo to bigtimjamestown
Quote:
Originally Posted by vwnate1 View Post
A ballast resisted ignition coil should _only_ be used in conjunction with a by - pass circuit so as to improve cold weather starting , 99-44/100 % of the time , this means solenoid operated starters only .

Accell also makes good , high output ignition coils .

they're FUGLY yellow though .
Good point Nate and for those of you that aren't quite sure what Nate is talking about when you use a ballast resister you should run a wire from the unused terminal on the starter solenoid ( I think it has an "R" on it) to the coil side of the ballast. What this will do is give your points a full 12 volts when starting only and make it easier to start....Big Tim
__________________
bigtimjamestown is offline   Reply With Quote
Old 11-08-2010, 01:20 AM   #7
skiter1961
Registered User
 
Join Date: Jul. 28, 2010
Location: California
Posts: 40
Thanks for all your help on this matter guys
skiter1961 is offline   Reply With Quote
Old 02-26-2012, 08:53 AM   #8
bennythebull
Registered User
 
Join Date: Feb. 26, 2012
Location: catlett,Va
Posts: 3
coil ballast

need help have a 1960 c-10 it has a resistor or something connected to the coil bracket. can i get a coil with a built in one or where to get anoyher
bennythebull is offline   Reply With Quote
Old 02-26-2012, 10:26 AM   #9
vwnate1
Registered User
 
vwnate1's Avatar
 
Join Date: Jan. 1, 2000
Location: AMERICA !
Posts: 9,917
Post Coil

If it's a little cylindrical shaped thing , that's a condensor for the radio , you can ignore it as long as there's a condensor under the dist. cap .

Your 1960 C/10 should have a " Calibrated Resistance Wire " feeding the coil , this means that when the points are open and you turn on the key & check the voltage to the coil , it reads 7 ~ 9 volts DC .

If so , test the coil's Ohms across the two little connectors , it should be about 1.6 ohms , any cheapo Multi-Meter (like the $4 one @ Harbor Freight) can be used to check , I'd highly suggest testing both as in 50 years much can be changed and this is a common problem , mis matched coils & power voltage , wiring harness repairs or modifications often result in 12 VDC to the coil and if it has the original typ of coil , it'll burn up points really fast .

If , OTOH , you have a ceramic rectangular shaped thing on the coil , that's a ballast resistor and you'll need the 1.6 Ohm coil .

The Ballast resistor is a standard NON GM part , Chryslers , Dodges etc. used them so your FLAPS will have one .

TEST before changing parts ! .

I hope all this is helpful & not too confuddling .
__________________
-Nate

' PASSION ' :

There are many things in life that will capture your eye , very few will capture your heart ~ those are the ones to persue .

Those are the ones worth keeping .
vwnate1 is offline   Reply With Quote
Old 02-27-2012, 08:39 AM   #10
Bill Hanlon
Registered User
 
Bill Hanlon's Avatar
 
Join Date: Jun. 4, 2002
Location: Klein TX
Posts: 1,705
Quote:
Originally Posted by vwnate1 View Post
Your 1960 C/10 should have a " Calibrated Resistance Wire " feeding the coil , this means that when the points are open and you turn on the key & check the voltage to the coil , it reads 7 ~ 9 volts DC .
Nate: I think you'd read 12V when the points are OPEN and 7 ~ 9 volts when the points are CLOSED.
__________________
Bill Hanlon is offline   Reply With Quote
Old 02-27-2012, 12:15 PM   #11
vwnate1
Registered User
 
vwnate1's Avatar
 
Join Date: Jan. 1, 2000
Location: AMERICA !
Posts: 9,917
Exclamation Ballasted Ignition

No ~ that's not how it works .

When you have 12 VDC to the coil , you need a 3 Ohm coil .

When you have 7 +/- VDC to the coil , you use a 1.6 Ohm coil .

Very important difference I learned the hard way .
__________________
-Nate

' PASSION ' :

There are many things in life that will capture your eye , very few will capture your heart ~ those are the ones to persue .

Those are the ones worth keeping .
vwnate1 is offline   Reply With Quote
Old 02-27-2012, 01:25 PM   #12
Bill Hanlon
Registered User
 
Bill Hanlon's Avatar
 
Join Date: Jun. 4, 2002
Location: Klein TX
Posts: 1,705
Quote:
Originally Posted by vwnate1 View Post
No ~ that's not how it works .
When you have 7 +/- VDC to the coil , you use a 1.6 Ohm coil .
I agree, but 7 volts when the points are CLOSED, not when OPEN as you originally said. If the points are open the + terminal on the coil will read 12 volts no matter direct connection, ballast resistor or "calibrated resistance wire".
__________________
Bill Hanlon is offline   Reply With Quote
Old 02-28-2012, 10:21 AM   #13
vwnate1
Registered User
 
vwnate1's Avatar
 
Join Date: Jan. 1, 2000
Location: AMERICA !
Posts: 9,917
Thumbs up

I may have just learned yet another new thing.....
__________________
-Nate

' PASSION ' :

There are many things in life that will capture your eye , very few will capture your heart ~ those are the ones to persue .

Those are the ones worth keeping .
vwnate1 is offline   Reply With Quote
Old 04-18-2013, 03:11 PM   #14
rira
Registered User
 
Join Date: Apr. 18, 2013
Location: the netherlands europe
Posts: 2
wiring with a pedal start

hi,
so i converted my truck to a 12v, but how should i wire the balast resistor?
the first part is easy, just from the ign. switch via the resistor to the + on the coil, but since there is no solenoid, there is no ~12v lead when starting only..

any ideas?


rob
rira is offline   Reply With Quote
Old 04-18-2013, 04:02 PM   #15
Bill Hanlon
Registered User
 
Bill Hanlon's Avatar
 
Join Date: Jun. 4, 2002
Location: Klein TX
Posts: 1,705
Our host sells a stomp starter switch with a provision for a bypass wire. Look here: http://www.classicparts.com/images/53-712.jpg
__________________
Bill Hanlon is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 11:23 PM.


Powered by vBulletin® Version 3.8.9 Beta 3
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
www.classicparts.com Copyright ©2006 Classic Parts of America, Inc. All rights reserved.