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Wiring diagram wanted
#1437265 Fri Jan 14 2022 05:32 PM
Joined: Apr 2020
Posts: 173
9
'Bolter
Hello I'm looking for a wiring diagram for 68 p/u, I've installed a 454 and 700r4,truck had no wiring what so ever when found, gathered up several harnesses, from that era and newer,and adding additional circuits, need info on colors and location of circuits through firewall connector,have some with 4 wires and some with 6, can mostly figure out where they go from connectors,gage of wire, and color,but diagram would be helpful. Note I do have a 75 truck service manual, that I might have to use, thanks for any help in advance


Karl j Townsend
Re: Wiring diagram wanted
9% grade #1437275 Fri Jan 14 2022 06:49 PM
Joined: Mar 2010
Posts: 1,075
B
Curmudgeon


"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
Re: Wiring diagram wanted
9% grade #1437633 Mon Jan 17 2022 05:44 PM
Joined: Mar 2010
Posts: 1,075
B
Curmudgeon
The link above has 14 pages of discussions.
Some errors were noted and discussed.
Don't take any wiring diagram, GM or otherwise, as 100% accurate.
Understand what you are doing and use the diagram as a guide.
The best "jpg format" diagram for visual clarity is on page 13.
http://67-72chevytrucks.com/vboard/showthread.php?t=185856&page=13
Use this link and save image as you wish.
Jpg or jpeg is a compressed format.
If I save the above image and then attach to this posting, it compresses again and clarity is lost.
If you have a PDF reader, you can use it to see the pdf file attached.

Attached Files
Wiring Diagram.pdf (1006.62 KB, 10 downloads)
Last edited by buoymaker; Mon Jan 17 2022 06:03 PM.

"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
Re: Wiring diagram wanted
9% grade #1437642 Mon Jan 17 2022 06:40 PM
Joined: Mar 2010
Posts: 1,075
B
Curmudgeon
Same diagram reduced 80% and cut into 4 parts (pages) so it can be printed on a standard printer.
Hopefully this is clear enough to use after being recompressed.

Attached Files
Page 1.jpg (86.98 KB, 20 downloads)
Page 2.jpg (114.16 KB, 20 downloads)
Page 3.jpg (95.95 KB, 20 downloads)
Page 4.jpg (56.2 KB, 20 downloads)

"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."

Moderated by  Rusty Rod 

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