C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

Distributor hookup

Thread Tools
 
Search this Thread
 
Old Jul 8, 2016 | 06:48 PM
  #1  
72350auto's Avatar
72350auto
Thread Starter
Instructor
10 Year Member
 
Joined: Nov 2005
Posts: 230
Likes: 0
From: Bridgewater, Nova Scotia, Canada
Default Distributor hookup

Hi all. I have recently purchased a 68 C3 from the estate of my brother. It was all apart and he was in the process of the rebuild. So I have now installed the engine and am ready to install the distributor. Looking at the pictures. There are 2 wires together pink and white wired into a connector. They are covered with the woven white cover. I believe these are from the starter switch?
They would have plugged into the connector on the distributor as pictured. On the side of the distributor is large something, maybe a condensor....not sure.
Maybe someone is familiar with this layout and what I need to add to it. Have not found a coil in the parts.
Any help appreciated.
I'll try and get better pictures if needed.
Also, the car does not have power brakes and it has a 4 speed so the pictured vacuum connector should be a single?





Reply
Old Jul 8, 2016 | 07:30 PM
  #2  
gerry72's Avatar
gerry72
Safety Car
20 Year Member
 
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
Default

The two bundled wires go to the + side of the coil. The wire from the distributor goes to the - side of the coil. The capacitor also goes on the coil negative post. Where do the bundled wires come from? One of the wires is from the starter solenoid "I" terminal. This wire feeds full battery voltage from the coil to the points when you turn the ignition key to the "start" position. The other wire is a resistance wire that feeds from the wiring harness and its purpose is to reduce current to the points once the ignition key is in the run position so as not to fry the points.
Reply
Old Jul 9, 2016 | 05:54 AM
  #3  
72350auto's Avatar
72350auto
Thread Starter
Instructor
10 Year Member
 
Joined: Nov 2005
Posts: 230
Likes: 0
From: Bridgewater, Nova Scotia, Canada
Default

Originally Posted by gerry72
The two bundled wires go to the + side of the coil. The wire from the distributor goes to the - side of the coil. The capacitor also goes on the coil negative post. Where do the bundled wires come from? One of the wires is from the starter solenoid "I" terminal. This wire feeds full battery voltage from the coil to the points when you turn the ignition key to the "start" position. The other wire is a resistance wire that feeds from the wiring harness and its purpose is to reduce current to the points once the ignition key is in the run position so as not to fry the points.
Thanks gerry72. Sounds logical. I messed myself up by assuming the connectors were meant for each other. Have to hunt for the missing coil.
Reply
Old Jul 9, 2016 | 07:03 AM
  #4  
Alan 71's Avatar
Alan 71
Team Owner
15 Year Member
Active Streak: 120 Days
Community Influencer
Top Answer: 5
 
Joined: Sep 2006
Posts: 31,173
Likes: 4,250
From: Westminster Maryland
Default

Hi 72,
I believe you'll find that the "large something" is the vacuum advance 'can' for the distributor.
A hose runs from that can to a port on the carburetor.
Here's a picture of a typical advance hook up.
The fitting on a 4-speed car has a single pipe as you surmised.
Regards,
Alan

Some times there's a piece of steel tubing as part of the connection.







Last edited by Alan 71; Jul 9, 2016 at 09:17 AM.
Reply
Old Jul 9, 2016 | 08:28 AM
  #5  
jnb5101's Avatar
jnb5101
Le Mans Master
 
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
Default

I always connected the capacitor to the + side of the coil.
Reply
Old Jul 9, 2016 | 11:53 AM
  #6  
Peterbuilt's Avatar
Peterbuilt
Le Mans Master
15 Year Member
 
Joined: Aug 2006
Posts: 7,417
Likes: 1,554
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
Default

Reply
Old Jul 9, 2016 | 09:11 PM
  #7  
72350auto's Avatar
72350auto
Thread Starter
Instructor
10 Year Member
 
Joined: Nov 2005
Posts: 230
Likes: 0
From: Bridgewater, Nova Scotia, Canada
Default

Originally Posted by Alan 71
Hi 72,
I believe you'll find that the "large something" is the vacuum advance 'can' for the distributor.
A hose runs from that can to a port on the carburetor.
Here's a picture of a typical advance hook up.
The fitting on a 4-speed car has a single pipe as you surmised.
Regards,
Alan

Some times there's a piece of steel tubing as part of the connection.






Hi Alan, thanks for the reply. It's not the advance. I looked at it closer and it says Mallory Corp on it. It looks like a min coil in shape. See picture below.



I think it is just a big condensor??
Reply
Old Jul 11, 2016 | 09:44 AM
  #8  
jnb5101's Avatar
jnb5101
Le Mans Master
 
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
Default

Where does the red wire go? It's not a capacitor. It's in series with the input (+) side of the distributor. Capacitors are added in parallel to coils to tune out inductance and allow the coil to saturate more quickly. Remove it.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-1

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-2

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-3

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-4

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-5

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-6

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-7

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-8

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

 Joe Kucinski
story-9

10 Most Common Corvette Problems of the Last 20 Years!

 Joe Kucinski
Old Jul 11, 2016 | 11:56 AM
  #9  
gerry72's Avatar
gerry72
Safety Car
20 Year Member
 
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
Default

It is a cap. You have to go back to the second photo in his original post to see that it is parallel. The black wire coming out of the distributor body is on the same post as the red wire that would go to the coil -. You can't see what's inside the distributor to know if it has the points/capacitor combo or just stand-alone points.
Reply
Old Jul 11, 2016 | 12:14 PM
  #10  
Alan 71's Avatar
Alan 71
Team Owner
15 Year Member
Active Streak: 120 Days
Community Influencer
Top Answer: 5
 
Joined: Sep 2006
Posts: 31,173
Likes: 4,250
From: Westminster Maryland
Default

Hi 72,
I'm sorry!
As soon as the parts start to veer away from 'more or less original' my knowledge drops off a cliff!
Looks like gerry and jnb will be able to help you figure out what you have!
Regards,
Alan
Reply
Old Jul 11, 2016 | 03:31 PM
  #11  
jnb5101's Avatar
jnb5101
Le Mans Master
 
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
Default

Gerry72 is absolutely correct. The mystery thingamagig is a capacitor and is wired in parallel with the coil. The red wire should go to the - side of the coil. But the capacitor should be connected to the + coil lead. I still would remove it, and replace it with one on the correct + coil terminal.
Reply
Old Jul 11, 2016 | 04:29 PM
  #12  
MelWff's Avatar
MelWff
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2006
Posts: 18,668
Likes: 2,564
Default

knowing which manufacturers distributor you have will help, is it Delco or Mallory, if Mallory is there a part number on it?

Last edited by MelWff; Jul 11, 2016 at 04:29 PM.
Reply
Old Jul 11, 2016 | 07:40 PM
  #13  
gerry72's Avatar
gerry72
Safety Car
20 Year Member
 
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
Default

Originally Posted by jnb5101
...But the capacitor should be connected to the + coil lead. I still would remove it, and replace it with one on the correct + coil terminal.
Maybe so. I based my original response on what the photos show and what is the most likely situation. I am looking at an aftermarket part (the cap) that is for some reason attached to the outside of the distributor. This leaves me to believe there are some aftermarket points under the distributor cap (not seen) that do not have the associate capacitor. If that is the case, then the wire coming from the cap would attach to the coil -. If there is a cap attached to the points, then the configuration you describe is correct where the wire out of the distributor goes to the coil - and the cap goes to coil +. But the OP would have to remove the current cap out of the line to the coil - if it follows an OEM configuration. We'll have to see what follows if or when he responds on the post.
Reply
Old Jul 12, 2016 | 02:23 PM
  #14  
72350auto's Avatar
72350auto
Thread Starter
Instructor
10 Year Member
 
Joined: Nov 2005
Posts: 230
Likes: 0
From: Bridgewater, Nova Scotia, Canada
Default

Hi all, thanks for the replies. Just found some more of the parts to this setup. It was setup with a Mallory Voltmaster Mark II ignition coil. My cell gave out so I couldn't get any better pictures. Inside the distributor the black wire goes to the points. Sorry for the terrible picture.


Reply
Old Jul 13, 2016 | 11:31 AM
  #15  
gerry72's Avatar
gerry72
Safety Car
20 Year Member
 
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
Default

Don't continue to use that coil. If it's what I think it is, it wasn't designed for continuous duty cycle in a daily driver application. There was a time, back before dinosaurs or thereabouts, where racers would use motorcycle coils on their car engines. Heavy emphasis on racers. Motorcycle coils have a fast rise and collapse rate so you could get more reliable and better performance than was available at the time in automotive coils. But motorcycles are different. A coil in a motorcycle app services but one -or two at the most- cylinder. Automotive apps have the coil servicing all eight cylinders. So, while the motorcycle coil gave better performance than the car stuff, they had a fairly short life and were subject to overheating and roasting themselves. What you have is the aftermarket's solution to racers using a motorcycle coil. It's better than a motorcycle coil but it will not have a long service life in a street car. I know it looks old and may have been around forever, but it's more a matter of how it was used. You can still buy coils like that today. They say they are for racing applications but some folks just want to go down that path regardless. I'm still confused by your distributor. Your early photos seem to show a Delco distributor, but there's not enough info in the picture to say that's for sure. Your last photo seems to show an aftermarket distributor. May not even be from the same application. Hard to say. It really doesn't matter, though. If there is no capacitor installed on the points, then you can use your external cap and run it as I described. If there is a cap on the points, then you remove it from the distributor wire and run the wire direct to coil -.
Reply
Old Jul 13, 2016 | 01:30 PM
  #16  
72350auto's Avatar
72350auto
Thread Starter
Instructor
10 Year Member
 
Joined: Nov 2005
Posts: 230
Likes: 0
From: Bridgewater, Nova Scotia, Canada
Default

Thanks for the reply Gerry72. It's quite confusing for sure. There is a PDF for this coil online and it is quite confusing. It won't be used. 2 days ago I opened another box that was with the car and there is a brand new HEI tach drive distributor. So thats the best route for me and that will be used. Problem solved. Thanks for the insight and replies.
Reply

Get notified of new replies

To Distributor hookup





All times are GMT -4. The time now is 01:55 PM.

story-0
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-1
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-2
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-3
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-4
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-5
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-6
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-7
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-8
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-9
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE