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Old 09-08-2022, 09:33 PM
Indy1k Indy1k is offline
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Default Wiring Diagram for 65 GTO with AC and Rally Gauges

Hi Folks,
I am looking for a wiring diagram for my 65 GTO that shows the connections for the Rally Gauges as opposed to the idiot lights.
I reference the drawings from pages 3WD-344 and 345. They show the indicator lights and not the actual gauge connections.
Does anyone know what manual they come from? maybe there is additional information.
I have all the shop manuals and cannot reference these pages.
There must be a manual I am missing.

My car is an original AC car. I do have the new engine compartment wiring harnesses that have the rally gauge sensor connections and the AC connections.

Thanks in advance,

Kevin

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Old 09-09-2022, 07:50 AM
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Quote:
Does anyone know what manual they come from?

I think they are from the Service Manual?
I am not near my books to see if there is any other diagrams.

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Old 09-09-2022, 08:11 AM
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Not sure those pics are from the Service Manual.

This is from the manual, has some extra stuff:

1965 Wiring


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Old 09-09-2022, 08:21 AM
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And a revision from Craftsman Service News:

1965 Revise

(doesn't really pertain to your quest probably)


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Old 09-09-2022, 09:46 AM
Indy1k Indy1k is offline
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Quote:
Originally Posted by johnta1 View Post
Not sure those pics are from the Service Manual.

This is from the manual, has some extra stuff:

1965 Wiring

Hi John, Yes, I have that one too in my 65 Tempest Chassis Shop manual. I was hoping there was a wiring diagram to reflect the Rally Gauge wiring and the AC wiring and how it connects to the main harness, I am going to order the 1965 Tempest GTO wiring diagram manual from Ames. Hopefully it is in there.
Or maybe if someone has that booklet, they can check for me.

Thanks,

Kevin

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Old 09-09-2022, 11:35 AM
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Here is the 65 AC wiring diagram from the "Tempest and GTO Wiring Diagram Manual" I've had since the early 80's. Pardon my markup, it was to help me keep track after going back to it a few decades later (ignore the High Speed Relay comment, you can call it that but Master Relay is the correct name I guess).
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Old 09-09-2022, 11:45 AM
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I have this diagram I downloaded from somewhere, possibly here.

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Old 09-09-2022, 11:54 AM
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There is a rally guage adapter from the Parts Place, it has a reference diagram that may be helpful for that. Yes it gets a little confusing because your standard harness will then have spare connectors/bulbs you don't use anymore, but you should be able to get everything up and running.
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Old 09-09-2022, 01:37 PM
Indy1k Indy1k is offline
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Default AC and Rally Gauge Wiring

Thank you all for the help with the drawings and diagrams. This should help immensely. I have all the new harnesses except my main dash harness. It is in excellent condition. I pulled apart the fuse block and cleaned all the wire spade lugs and the fuse holders. I have to do a continuity check on it to make sure the circuits are all functioning. Someone had installed a toggle switch under the dash to turn on the headlights. It was wired into the dimmer switch. All because of a pushed in contact in the firewall side of the fuse block. All fixed now.
Thanks again.

Kevin

Third and final 65 GTO

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Old 09-09-2022, 01:39 PM
Indy1k Indy1k is offline
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Thank you all for the help with the drawings and diagrams. This should help immensely. I have all the new harnesses except my main dash harness. It is in excellent condition. I pulled apart the fuse block and cleaned all the wire spade lugs and the fuse holders. I have to do a continuity check on it to make sure the circuits are all functioning. Someone had installed a toggle switch under the dash to turn on the headlights. It was wired into the dimmer switch. All because of a pushed in contact in the firewall side of the fuse block. All fixed now.
Thanks again.

Kevin

Third and final 65 GTO

  #11  
Old 09-09-2022, 03:36 PM
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Quote:
Originally Posted by Indy1k View Post
Thank you all for the help with the drawings and diagrams. This should help immensely. I have all the new harnesses except my main dash harness. It is in excellent condition. I pulled apart the fuse block and cleaned all the wire spade lugs and the fuse holders. I have to do a continuity check on it to make sure the circuits are all functioning. Someone had installed a toggle switch under the dash to turn on the headlights. It was wired into the dimmer switch. All because of a pushed in contact in the firewall side of the fuse block. All fixed now.
Thanks again.

Kevin

Third and final 65 GTO

"Third and final", that is funny!

I guess I should say I'm on my first the second time and last, then!

Good luck with the wiring.

  #12  
Old 09-12-2022, 09:14 AM
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We need to split the difference someday and have our 65's meet in the "middle", maybe Tampa. I was just down near Cape Coral picking up a boat a few weeks back, was only about 30 minutes away.

Or I'll just bring it down to Fort Myers/Cape Coral area for a car show someday. Took it up to New Smyrna Beach for one of their monthly shows, great setup and hundreds of classics.

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