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Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 09-07-2013   #1 (permalink)
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Default 1967 Mustang 289 Wiring Problems

Hello Everyone!

I am working on my recently acquired 1967 Mustang 289 and I am having some trouble with the wiring. There was a fire under the hood and the electrical components melted in some parts and just a cluster in other parts. I have figured a good deal of it our but there are a few things I'm still stuck on. Mainly, I have some wiring pictured below that I could use some help with.

First I have this rainbow wiring in my trunk that was cut at some point, I have no idea what this is:
http://i229.photobucket.com/albums/e...photo1copy.jpg

Then there are all these wires coming out of the wire bundle that runs along the metal beam along the front end of the car. The wire bundle comes out of this hole under the battery tray:
http://i229.photobucket.com/albums/e...s11/photo5.jpg

Then these are the wires:
This one I believe just goes on the positive terminal of the battery(red wire)?
http://i229.photobucket.com/albums/e...s11/photo2.jpg

This one I believe just connects to the negative terminal of the battery (1 black and 1 yellow wire)?
http://i229.photobucket.com/albums/e...photo2copy.jpg

This one I have no idea, its a cap-style connector but I do not know where it came from, solid black cable.
http://i229.photobucket.com/albums/e...photo3copy.jpg

This is a connector, it has a white cable, black cable with red line, and solid blue/black cable.
http://i229.photobucket.com/albums/e...s11/photo1.jpg

Then there is one cable in that bunch that runs directly from that bundle into another bundle that runs under the alternator.

Then there is this connector that runs from the wire bundle from behind the alternator, does this connect to the connector from the front bundle?
http://i229.photobucket.com/albums/e...s11/photo4.jpg


Thanks in advance for any help!
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Unread 09-07-2013   #2 (permalink)
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You have like three wire harnesses with which to deal in the engine compartment: Headlight, gauge and alternator. If the car was in a fire then why not just replace all three? And yes, the alternator harness does connect into the headlight harness as well as the alternator. I just got done replacing all three harnesses on my 65 and, although it may seem confusing at first, it is really simple and straightforward. Cost for all three is about $200.
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Unread 09-07-2013   #3 (permalink)
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randal,

Where did you get those wiring harnesses? I am pretty electrically incline but I am stumped here so I wouldn't be against spending some money and getting it all taken care of. Who did you order those through? Thanks!
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Unread 09-07-2013   #4 (permalink)
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any Mustang supplier will carry them. Do you have a tach or not? If you don't (I'm assuming you don't), you would need these ones (they have installation instructions on the website for engine feed harness, written by yours truly):

Mustang Alternator Wiring Harness Without Tachometer 6-Cylinder/Small Block 1967-1968 | CJ Pony Parts

Gauge feed harness:

14289 67SBW/OT-E Mustang Engine Gauge Feed Wiring Harness Small Block V8 Without Tach 1967-1968 | CJ Pony Parts

For the harness you'd also need this spade adapter that goes on the oil pressure sending unit:

C7ZZ-9278-ADAPT Mustang Scott Drake Oil Pressure Sender Spade 1967-1968 | CJ Pony Parts

And headlight harness:
1429067 Mustang Headlight Wiring Harness GT From Firewall 1967 | CJ Pony Parts

I have the first three and they were acceptable quality and decent fit, looked just like the originals. I can't attest to the headlight wiring harness, I've heard some people haven't been happy with the Mr. Mustang ones.

You may also need a new battery cable set (I wrote installation instructions for that too):
67-BC-ALL Mustang Battery Cable Set All 1967 | CJ Pony Parts

And you may also need a new engine ground strap:
C5ZZ-14289-GW Mustang Scott Drake Engine/Firewall Ground Cable 1965-1967 | CJ Pony Parts

I have these last two as well and they were good quality. There is also a Scott Drake ground strap with FoMoCo on it if you want that instead...it's $9.99 though.

All my wiring is new with the exception of the headlight harness, mine was still in good shape. This here is all the wiring you would need in your engine bay to wire everything up.

You may also need to go to Walmart and get some red ignition wire (in the automotive section) for running miscellanous feeds, such as electric choke positive (if you have one), and if you have an electronic distributor that needs to be tied into the ignition somewhere before the pink resistor wire.
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Unread 09-07-2013   #5 (permalink)
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hey arizona67fast, Any of the mustang vendors carry these and a schematic book for your car. Order a catalog from say CJ pony parts and get ready to part with some coin! if your under dash harness is in bad shape you may want to think about an upgraded complete harness from someone like painless. There is also a small company out there that rebuilds your under dash harness as well. Lots of options depending on what your building or what you need. There is also a good auto elec book out there called automotive wiring and electrical systems by tony candela- a good read to further your skills/understandings of what goes into a cars systems and why
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Unread 09-08-2013   #6 (permalink)
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I appreciate the feedback from both of you! I just went outside and spent some time going through it, my gauge cable is in pretty rough shape so I ordered a new one of those. My alternator harness is completely melted on to the back side of the alternator, so I ordered a new one of those too.

My headlight harness is in great shape all the way around except for the last few components by the battery. That is an expensive piece and looks like a cluster of wires in the picture. The wires from there look salvageable anyways so I am hoping I can make it work!

on the headlight wiring harness by the battery, If I am correct, the three prong connector (1 m, 2 f) plugs into the alternator harness? And the two cap style connectors that come of out there go on the solenoid on the studs labeled "S" and "I"? If that is the case then I should be good! Can one of your verify that and tell me if I'm right? I would greatly appreciate it!
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Unread 09-08-2013   #7 (permalink)
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That is correct, but you have to make sure you have the right cables going to the correct studs on the solenoid. The red wire with blue stripe goes to the S stud (should be the left one).
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Unread 09-08-2013   #8 (permalink)
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You are a life saver! Man I was beating myself up today because I could not figure this out, thanks so much for the links and all the information, I spent a good amount of money tonight but it will be well worth it when I can get my baby fired up! I appreciate it!

All my parts should be in soon and I'm sure I'll have some questions, but I'll save those for when they get here. Thanks for everything!
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Unread 09-08-2013   #9 (permalink)
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I have a 67 too. To see the installation instructions on those links (if they have them), just scroll all the way to the bottom of the page and you'll see them. Otherwise I can take pics of how something is supposed to go or walk you through anything. Of course, many other people here could do that for you too.

//edit: I should have told you first...if you were ordering from CJ's to wait until they have a sale (they have them frequently), or just buy the headlight harness on one order. Then you get 161 RPM points. Make a second order and you can use those RPM points to that order which gets you $5 off. Not a big deal, you'll have over 200 RPM points which gets you $10 off your next order.
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Unread 09-08-2013   #10 (permalink)
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The one thing I would add is that I only buy wire harnesses made by a company called Alloy Metal Products(AMP). They make excellent reproductions. But if you have already ordered, don't sweat it. They may come as AMP but if not, the quality will probably be acceptable. I just prefer AMP and always check with the vendor to see what they stock.
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Unread 09-09-2013   #11 (permalink)
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Have you found out what caused the fire and fixed it?

There are lots of free wire diagrams on the net, you need to download several and make sure you understand how all this works. I have drawn out the ignition system and the taillights with colored pencils just to make sure I understood.

Keep in mind a few things about the factory harnesses. They run away from moving and hot things, and simple for the line worker to install.

Harbor Freight has precut kits and rolls of shrink tube fairly cheap. You can replace a rubber factory connector with good bullet singles. Spend the money for the good ones.
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The things that I've been told caused the fire was that it was rebuilt and the mechanic that rebuilt it either forgot a part or incorrectly assembled it so on the way home from the shop gasoline was sprayed all over the engine compartment and caught on fire. My plan is stuff to replace the carb but I want to get all the electrical stuff figured out first. Thanks for your input everybody and I'll let you know how it goes when all the parts get in!
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Unread 09-13-2013   #13 (permalink)
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Alright everyone, I need the help of the mustang gods!

I got my new wires yesterday and I installed then and everything was looking great and I felt confident in my work and i was ready to connect the battery. I went to connect the battery and when I hooked up the positive terminal I saw a spark so what went through my mind was "great! the circuit is connect and it works!" Then I went into the the drivers area and I saw white smoke and smelt a electrical burning. I immediately disconnected the battery and I went and tried to see where the smoke was coming from. I couldn't see the smoke anymore but the smell was still strong, I saw the fuse box with 5 fuses in it, but they all looked fine and intact. I assumed the smoke was from burning through the fuses, but I was not able to see any visible damage. Is it possible for the fuses to be damaged without visible damage? Or does anyone have any idea what was smoking or why it would be smoking? Anything helps! Thanks in advance!
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