Engine harness question - Pontiac GTO Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 12-30-2013, 01:39 PM Thread Starter
 
raven08r6's Avatar
 
Join Date: Feb 2012
Location: South TX
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Engine harness question

I have a 67 but it has a 69' 400 in it. I need to replace the engine harness since the prev owner decided that 3 colors of wire for every wire in the car was a better idea then factory making a diagram painful to look at. My question is how do I determine which variation of the engine harness I need?

I am good with electrical, some motor, but this is my first rebuild/restore.

BTW you really do not want to know how the dash harness looks.

Just starting my 67' restore
raven08r6 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 12-30-2013, 01:55 PM
Super Moderator
 
BearGFR's Avatar
 
Join Date: Aug 2008
Location: Springtown, TX
Posts: 5,742
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 122 Post(s)
Garage
There are only three possibilities for the main engine harness: internal voltage regulator and ram air, internal voltage regulator without ram air, and external voltage regulator. I can tell you from experience that the differences between them are minute. I adapted my external regulator harness to work with a CS130 (internal regulator) alternator and it was easy-peasy. All it took was an additional jumper on the alternator and a jumper on the voltage regulator connector - I didn't have to cut or modify the engine harness at all. The front end lighting harness is the "other" big harness in the engine compartment on the other side of the firewall connector. If the car has a/c, the engine compartment leg of that harness is separate and get's its power feed via an inline fuse holder coming off the back side of the alternator, running over to the compressor and to the fan blower motor high speed. If the car has a tach, then there's a single separate tan wire off the coil that goes directly to the tach terminal. (All the preceding is applicable to model year 1969.)

Bear

BearGFR
Springtown, TEXAS
BearGFR is offline  
post #3 of 6 (permalink) Old 12-30-2013, 02:12 PM
64-67 Expert
 
geeteeohguy's Avatar
 
Join Date: Feb 2008
Location: Fresno, California
Posts: 8,541
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 117 Post(s)
I replaced the engine harness in my '67 3-4 years back using an AMES harness. My car is a standard base YS 400. (with the common external voltage reg and plain log manifolds). Piece of cake. All of the connections and colors are correct. Plug it in and go.
geeteeohguy is offline  
 
post #4 of 6 (permalink) Old 01-15-2014, 06:27 PM Thread Starter
 
raven08r6's Avatar
 
Join Date: Feb 2012
Location: South TX
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
thanks for the answers:

after a little more investigating.

The alternator has one wire going to it - and a loop/jumper
the wiring from the distributor cap - bypasses the chopped harness - and runs under the dash.

good thing is there is no A/C.

Still pulling off all the tape the prev owner used

Just starting my 67' restore
raven08r6 is offline  
post #5 of 6 (permalink) Old 01-16-2014, 02:58 PM
Super Moderator
 
BearGFR's Avatar
 
Join Date: Aug 2008
Location: Springtown, TX
Posts: 5,742
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 122 Post(s)
Garage
Sounds like the car has been converted from using an external voltage regulator to using an alternator with an internal regulator. Is the external regulator still present? Connector? Any jumpers there as well?

Bear

BearGFR
Springtown, TEXAS
BearGFR is offline  
post #6 of 6 (permalink) Old 01-16-2014, 06:27 PM
 
68GTO4004Spd's Avatar
 
Join Date: Jun 2008
Location: Columbus, OH
Posts: 659
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 1 Post(s)
You might want to contact M&H wire harness and tell them you situation. They can build you a custom harness that will fit your needs of a 67 with a 69 engine.
68GTO4004Spd is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Engine Harness 1969GTOkid 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion 3 04-12-2012 07:03 PM
68 HO engine harness routing FlambeauHO 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion 11 11-29-2011 12:44 AM
dash harness/engine harness questions oilburner66 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion 3 10-02-2011 09:27 AM
engine harness ? zzomby 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion 3 10-30-2009 11:17 PM
engine harness 67goat56 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion 8 04-26-2009 07:14 PM

Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome