Color Wiring Diagram FINISHED

[w00dst0ck]

For all the guru's, PO put a HEI in my '70. It's wired to the 12P, but it's constant hot for some reason. Put a new ignition switch in the truck and still the same issue. Traces back all the way to the switch. Also currently the unfused ignition slots and the fuse above are constant hot.

Any suggestions? I'm tempted to just run another switched power wire, but that doesn't explain why I'm getting a constant hot.

[HoustonGuy]

can someone email me a copy? cavazosmark@hotmail.com

[asesapie]

The diagrams are great but they aren't for a GMC with the four eyes up front and AC. Anyone have a diagram for a '68 GMC with factory AC?

[onetonwrecker]

Hey could I get an email of the larger version please chris_san2011@yahoo.com

[jimbosprint]

I spent some time (a lot of time actually) re-drawing this in Adobe Illustrator so everything would be easier to read. There are a couple minor edits based on what I have found in my two trucks.

Send me a PM with your email address if you would like me to send it to you.

[sharkskinman]

Email me the actual files??
Spoonpappy@gmail.com

[70gmc4d]

Originally Posted by boundstaffpress

V8 engine and cab


Link for the largest version
4200x2550

I don't see the three wires to the trany. I see the one green and one black to the reverse switch. My 70 GMC has three wires, dark green and light green to the switch and the black wire I just assume is a ground. But you know what they say about assuming. Thanks for the diagram it helps a ton!

[chuchito]

I have a 1972 GMC suburban, and the wiring is driving me crazy. The diagrams I found on here look similar to what I see under the hood but not exactly. Also, I don't see the blue wire that is supposed to be to the oil pressure on my harness but my guage cluster does have a oil pressure guage. The engine harness actually only has 5 wires. I unplugged it and looked at the female plug on the firewall and it also only has 5 inserts. The five wires I have are the tan, dark green, purple,pink, and brown with white. Can someone chime in?

[TOYDOC]

Thank you for taking the time to make a diagram like this! if possible could you e-mail me a copy at ctoydoc@gmail.com

Thank you!!

[70gmc4d]

Originally Posted by chuchito

I have a 1972 GMC suburban, and the wiring is driving me crazy. The diagrams I found on here look similar to what I see under the hood but not exactly. Also, I don't see the blue wire that is supposed to be to the oil pressure on my harness but my guage cluster does have a oil pressure guage. The engine harness actually only has 5 wires. I unplugged it and looked at the female plug on the firewall and it also only has 5 inserts. The five wires I have are the tan, dark green, purple,pink, and brown with white. Can someone chime in?

My 70 GMC has a mechanical oil pressure gauge that is plumbed in the block next to the distributor. And the 70 gmc has 4 headlights up front.

[chuchito]

Originally Posted by 70gmc4d

My 70 GMC has a mechanical oil pressure gauge that is plumbed in the block next to the distributor. And the 70 gmc has 4 headlights up front.

Maybe that's how mine is too. There is a metal line that looks like it would go next to the distributor.

[70gmc4d]

Originally Posted by 70gmc4d

I don't see the three wires to the trany. I see the one green and one black to the reverse switch. My 70 GMC has three wires, dark green and light green to the switch and the black wire I just assume is a ground. But you know what they say about assuming. Thanks for the diagram it helps a ton!

Just a heads up I'd anyone else had the same issue. I did ground the black wire to the fire wall and when I fired up my truck this weekend the backup lights work awesome.

[DBear]

on this diagram, is the alternator on the driver side, labeled " A.C.F GEN R....or something like that?

[DBear]

I too would like one emailed to me at twbailey75@yahoo.com. Thanks

[oneshot]

Would you email me the files-oneshot@lakeland.ws.
Thank you,
Scott

[flykelley]

Hi Can you please email me a copy also?

flykelley930@mac.com

Thanks Mike

[cagodinez]

Can you please send me a copy at
alonzo_51@yahoo.com

THANK YOU!

[jrock51]

can I get a copy as well please?
justin_heil@hotmail.com
Posted via Mobile Device

[rsgt]

I would like one please. fgsltwthg@aol.com

[Foot Stomper]

Just scanned the pages looking for a wiring diagram for the 1959 GMC.
Does anyone have? I might even make a Chevy one work too...
TIA

[Jaik]

Does anybody have a diagram for a 57 apache? I bought a new harness with updated fuse box kit. Ive got the basics hooked up. The motor runs again. I can figure it out but a reference would make it easier.
Thanks guys

[cpnbnanamn]

Did a high-res version ever get posted anywhere? Also, can I assume the diagram is the same regardless of the engine?

[396C-10]

Originally Posted by Rocmonkey

I have read a bunch of your posts/replies and DANG! you are one smart feller! I wish I knew 1/10 of what you know just about wiring. Thanks for the advice- I've been using it secretly (or, trying to).

........... Meee Toooo!

[garciajulian]

Can I get a digram to Please sent to garciajulian@grandecom.net Thanks

[BronzeGMC]

Please copy sent andy.j.bock@gmail.com
Thank you