The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Electrical

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-06-2018, 10:09 AM   #1
thegrandiman
Registered User
 
Join Date: Oct 2012
Location: Hustontown, PA
Posts: 12
Help with 1968 Wiring

Obviously there's a few wires here that need attention. But I'm not sure how to go about replacing them. How do they come out of that block? I dont want to damage more of them if I don't have to. Any help would be appreciated.

Matt
Attached Images
  
thegrandiman is offline   Reply With Quote
Old 01-06-2018, 01:59 PM   #2
VetteVet
Msgt USAF Ret
 
VetteVet's Avatar
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 7,880
Re: Help with 1968 Wiring

This is the main connector between the engine wiring and the cab wiring. It is held together by a small bolt in the center of the connector that threads into the cab side behind the fuse panel. If you remove the bolt you can pull the connector apart and see the wiring terminals on the inside. The nut for the bolt is captured in plastic on the inside connector, and it can spin with the bolt if it is corroded. So use care when taking the bolt out. You might have to remove the fuse panel to access the nut.

These terminals are called Packard terminals and can be tricky to free up from the connector. They have a small leg on the terminal that is bent sideways so that it snaps into the connector to hold it in place. To remove it you have to bend the leg flat with the rest of the terminal to unlock it so you can pull it out of the connector. There's a thread on here that explains it with pictures if I can find it I will post it.

The wire you are showing in the top of the connector is the resistance wire from the ignition switch to the ignition coil and the cloth covering is peeled back showing the wire. This wire is not needed if you convert to HEI ignition which a lot of member do, me included.


Here is the bolt.Name:  DSC00637.jpg
Views: 15
Size:  80.1 KB


Here is the terminal and you can see the leg that must be bent.

Name:  images.jpg
Views: 15
Size:  5.3 KB
__________________
VetteVet

metallic green 67 stepside
74 corvette convertible
1965 Harley sportster
1995 Harley wide glide

Growing old is hell, but it beats the alternative.
VetteVet is offline   Reply With Quote
Old 01-06-2018, 03:40 PM   #3
VetteVet
Msgt USAF Ret
 
VetteVet's Avatar
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 7,880
Re: Help with 1968 Wiring

Here's the thread. Scroll down to post 13 and read through 16 for help on removing the terminal.
http://67-72chevytrucks.com/vboard/s...d.php?t=148346
__________________
VetteVet

metallic green 67 stepside
74 corvette convertible
1965 Harley sportster
1995 Harley wide glide

Growing old is hell, but it beats the alternative.
VetteVet is offline   Reply With Quote
Old 01-06-2018, 05:05 PM   #4
thegrandiman
Registered User
 
Join Date: Oct 2012
Location: Hustontown, PA
Posts: 12
Re: Help with 1968 Wiring

Awesome. I really appreciate the info. I'll dig into. I just got the truck. I believe the previous owner installed an Electronic Ignition. So if that is the gas, I can just remove that wire?
thegrandiman is offline   Reply With Quote
Old 01-06-2018, 07:05 PM   #5
VetteVet
Msgt USAF Ret
 
VetteVet's Avatar
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 7,880
Re: Help with 1968 Wiring

........
Quote:
Originally Posted by thegrandiman View Post
Awesome. I really appreciate the info. I'll dig into. I just got the truck. I believe the previous owner installed an Electronic Ignition. So if that is the gas, I can just remove that wire?
Yes and that wire splices into a wire from the starter that sends a full 12 volts to the ignition coil in the points system, which gives a hotter spark when cranking the engine for easier start. After running, the ignition reverts back to the resistance wire (shown in your picture) for normal ignition to prevent the coil from overheating.

Here is a diagram of the wiring in the stock trucks. If a previous owner has installed an HEI ignition distributor it needs a full 12 volts and you can disconnect the resistance wire.

notice the starter just above the engine block where the yellow wire joins the W\orange\purple wire from the bulkhead junction.

Name:  fusible link.jpg
Views: 14
Size:  91.8 KB
__________________
VetteVet

metallic green 67 stepside
74 corvette convertible
1965 Harley sportster
1995 Harley wide glide

Growing old is hell, but it beats the alternative.
VetteVet is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
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 -4. The time now is 11:26 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Copyright 1997-2013 67-72chevytrucks.com