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Old 07-05-2024, 02:14 PM
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Badgoat64 Badgoat64 is offline
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Default Suggestions for new wiring on 64 GTO (Painless, American Auto wire, etc.)

We have a 64 GTO that needs to be rewired. Iím looking for suggestions on what brand of wiring kit to buy. I have a mixture of stock parts and mods that have been done to the car. The engine is a 461 stroker, it has an electric radiator fan, electric fuel pump, air conditioning, and bigger alternator. I want to make sure I have expansion space available for possible EFI and a decent sound system in the future.

I talked to Painless, and they do not offer a kit specific for a 64 GTO. They recommended their 23 circuit GM muscle car kit, part #10402.

Iím leaning toward this Painless kit at the moment. Has anyone bought and installed a kit that they recommend?

  #2  
Old 07-05-2024, 03:20 PM
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I put the American Autowire Classic Update kit in my '64 GTO. I was really pleased with the quality and instructions. I bought the large and small crimpers too. The crimpers are a must have!

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Old 07-05-2024, 09:55 PM
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Originally Posted by JSchmitz View Post
I put the American Autowire Classic Update kit in my '64 GTO. I was really pleased with the quality and instructions. I bought the large and small crimpers too. The crimpers are a must have!
Thanks for that info. This actually looks really good. How long did it take to complete? With this kit, is there extra space for accessories?

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Old 07-06-2024, 01:39 PM
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Chris65LeMans Chris65LeMans is offline
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M&H. It's an exact replica of the current harness, so it makes swapping 'em out easier. They have great customer service, too - call 'em up and ask about your expansion questions - I'm sure they have a solution for that.

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Old 07-06-2024, 02:39 PM
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I used American Autowire Classic Update in both cars. It's the best of both worlds, you can do stock or it has built in options for aftermarket parts (electric fan, fuel pump, factory or aftermarket gauges, electric speedo, different ignition systems, different charging sys). Comes with everything you need. The wiring feeds are extra long so you can route them any way you want, that said, you have to terminate every connection either crimp or solder. I've used Painless in the past which is okay for pure stock, but I like AAW better because I'm not a purist. AAW Classic kit will take longer that the stock type replacements because you have to attach all the terminal ends.

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Old 07-08-2024, 11:15 PM
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Another vote for American Autowire Classic Update kit. I used it on my '66 and it's great. I rewired my entire car, having never done auto wiring in my life before, and everything worked perfectly the first time. Love the updated features of the Classic Update kit as well. Another thing that makes it nice is that, unlike the stock wiring setup, it has an upgraded headlight switch and dimmer switch that allows the headlights to get more voltage, which translates to brighter headlights and better nighttime visibility. There's a number of good reasons to go with the Classic Update kit if you are concerned with being 100% original.

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Last edited by ZeGermanHam; 07-08-2024 at 11:22 PM.
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Old 07-09-2024, 07:04 AM
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Quote:
Originally Posted by Badgoat64 View Post
Thanks for that info. This actually looks really good. How long did it take to complete? With this kit, is there extra space for accessories?
You're welcome. I don't have a good estimate on completion time. I did it a little at a time over months. It has lots of extra circuits vs. stock. At least for my car it did. I do have a sub panel for LS swap relays and fuses.

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Old 07-09-2024, 08:05 AM
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For those of you that used the classic update instead of the M&H harness and had to cut their firewall for the larger fuse panel, how does it look? Is the cut out part obvious or does it look OK? Is the switch to modern fuses worth it? My car is completely gutted and I could go either way, but I have no plans to change to HEI or anything, so I am not sure if the upgrade is worthwhile.

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Old 07-09-2024, 08:15 AM
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Quote:
Originally Posted by drewm View Post
For those of you that used the classic update instead of the M&H harness and had to cut their firewall for the larger fuse panel, how does it look? Is the cut out part obvious or does it look OK? Is the switch to modern fuses worth it? My car is completely gutted and I could go either way, but I have no plans to change to HEI or anything, so I am not sure if the upgrade is worthwhile.

Yes, very much so.

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Old 07-09-2024, 08:27 AM
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Quote:
Originally Posted by drewm View Post
For those of you that used the classic update instead of the M&H harness and had to cut their firewall for the larger fuse panel, how does it look? Is the cut out part obvious or does it look OK? Is the switch to modern fuses worth it? My car is completely gutted and I could go either way, but I have no plans to change to HEI or anything, so I am not sure if the upgrade is worthwhile.
I only had to cut a small part out. Looks fine to me.

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Old 07-09-2024, 01:11 PM
drewm drewm is offline
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Originally Posted by Scarebird View Post
Yes, very much so.
One more thing. I am a bit colorblind. I have no problem with electrical work, but sometimes with so many wires bunched up, it get a little confusing. I believe the M&H wires are labeled (as well as the correct color). Do you know if the AAW upgrade is also labeled or just color coded?

Thanks!

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Old 07-09-2024, 02:37 PM
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IIRC the plugs are labeled, not the wires.

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Old 07-10-2024, 10:34 AM
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Quote:
Originally Posted by drewm View Post
For those of you that used the classic update instead of the M&H harness and had to cut their firewall for the larger fuse panel, how does it look? Is the cut out part obvious or does it look OK? Is the switch to modern fuses worth it? My car is completely gutted and I could go either way, but I have no plans to change to HEI or anything, so I am not sure if the upgrade is worthwhile.
It's 100% worth it, in my opinion. Here are some photos of my car showing how I expanded the opening for the fuse block. With the car fully assembled, it looks like it could be OEM if you didn't know any better. It's fairly buried under the brake booster anyway.









Quote:
Originally Posted by drewm View Post
One more thing. I am a bit colorblind. I have no problem with electrical work, but sometimes with so many wires bunched up, it get a little confusing. I believe the M&H wires are labeled (as well as the correct color). Do you know if the AAW upgrade is also labeled or just color coded?

Thanks!
At least on the AAW Classic Update kit, the wires are both color coded AND labeled with identifying text. You can see some of the text on the wires in my photo above. It could not be any easier. The kit is not pre-terminated with the plugs, so you will have to route & bundle everything, then terminate w/plug. This is preferred over pre-terminated wiring, IMO, as you can make adjustments and improvements with wire routing.

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Last edited by ZeGermanHam; 07-10-2024 at 10:53 AM.
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