| View previous topic :: View next topic |
| Author |
Message |
ahall1
Member
Joined: Jun 09, 2020
Posts: 10
|
 Posted: Sat Jun 13, 2020 7:14 am Post subject: ignition coil 6 volt on 12 volt system? |
 |
|
| OK to use new 6 volt coil i have on hand for my 12 volt system? |
|
| Back to top |
|
 |
wesk
Site Administrator
Joined: Apr 04, 2005
Posts: 16400
Location: Wisconsin
|
| Posted: Sat Jun 13, 2020 9:14 am Post subject: |
|
|
From the 1920's to 40's ignition coils were commonly 6 volt as were most electrical systems. As the 12V systems began to appear thru the 40's and 50's the need for more coil power did not occur. So the manufacturers just added a ballast resistor to most firewalls and continued with the 6 volt coil. By the late 50's/early 60's we had what appeared to be 12V coils enter the market. In reality they were still the original 6V coils but now they had internal/integral ballast resistors. Coils did not change much from the 1920's thru the 1970's but then came new type high energy ignition systems and computer controls and finally coils started taking new shapes and new internal construction.
So if you truly have an original pre-1970's 6 volt coil then to use it with your 12V jeep you will need the same ballast resistor used on the 12V CJ5's from the mid 50's on.
_________________
Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php |
|
| Back to top |
|
|
ahall1
Member
Joined: Jun 09, 2020
Posts: 10
|
| Posted: Sat Jun 13, 2020 12:04 pm Post subject: |
|
|
| thank you thats what i will do .Is there different mfg of ballast resistors? Do they mount on firewall? |
|
| Back to top |
|
|
wesk
Site Administrator
Joined: Apr 04, 2005
Posts: 16400
Location: Wisconsin
|
|
| Back to top |
|
|
ahall1
Member
Joined: Jun 09, 2020
Posts: 10
|
| Posted: Sun Jun 14, 2020 3:56 am Post subject: ballast resistor |
|
|
| thank you .Al Halliday. Nova Scotia Canada |
|
| Back to top |
|
|
Jeff_Lee
Member
Joined: Jan 27, 2014
Posts: 151
Location: West Palm Beach FL area
|
| Posted: Wed Jun 17, 2020 9:26 am Post subject: |
|
|
With most of the stuff we have for our old jeeps, they are dirty and well used and labels have disappeared. I have found that most coils give you some clues.
Unfortunately not consistently applied, but many later coils have embossed on the bottom of the coil can their resistor status. For example, one of my coils states "For Use With External Resistor" on the bottom of the coil. Another older coil I have has a large "6V" embossed on the bottom. Also check the plastic or Bakelite tops of the coils. Many have small notations there like "12V" integrally molded in.
I give coils a good wipe down and external inspection for these clues.
It's a good place to start when trying to figure out what you have, and whether a resistor needs to be employed.
Cheers
_________________
1951 M38 restoration project - Flightline Jeep MC 23923 DoD 6-51
1954 M-100 Trailer USMC Dunbar Kapple s/n M-750759 DoD 1-54
1947 Willys CJ2A - Harvest Green
1954 Ford F-100 Parts chaser - blueprinted Y-Block
Southeast Florida |
|
| Back to top |
|
|
4x4M38
Member
Joined: May 30, 2014
Posts: 3478
Location: Texas Hill Country
|
|
| Back to top |
|
|
|
Forum FAQ
Search
Usergroups
Profile
Log in to check your private messages
Log in
