Fix or Replace

T

Tveditr

Member
My 30 Model A coupe has what I think is the original wire loom. I have been having problems with shorts and bad connections. While looking into these issues I have run into areas where the fabric insulation is just gone. Do I look for these bare wire areas and fix them or just replace the entire wire loom.
 
The wiring is 90 years old...it ain't going to get better.
I would replace with fresh wiring and be happy knowing my Model A isn't going to catch fire.
 
There is really no good way to repair the original type cloth & resin covered wire. Replacement harnesses are out there. Some may be better than others. The light switch and terminal box are the busy spots with wiring. The model A is about as simple as it gets and most of the wiring sets come with a decent diagram. A person has to know what type of light switch they have and whether the car has park/cowl lamps or single element headlamp bulbs like the early 28 cars. A cross over is required if the car has an add on tail lamp. electric wipers also had a wire if so equipped.

An add on fuse at the starter switch is always a good idea. A lot of folks add a heavy duty cut off switch on the battery ground cable as well.
 
Replace so you do not have this happen
 

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There are several companies and individuals that make outstanding wiring harnesses. The original harness is only about to get worse. No question, replace!
 
Replace it. Sacramento Vintage Ford makes their own harnesses that are excellent quality at a reasonable price. They also use the braided wire covering like the original. You can't go wrong with these guys.
 
An add on fuse at the starter switch is always a good idea. A lot of folks add a heavy duty cut off switch on the battery ground cable as well.
Click to expand...
Yes, this is very important! -


I replaced all cables individually with new ones (old finish) with a slightly larger diameter. I have installed fuses so that they cannot be seen. And also a main switch behind the heels.
 
Some things you just cant fix back to an original state of condition. Plus a fire can destroy
the whole car. You will be surprised how everything works so much better with a new harness. Bite the bullet and change it out.
 
Study the wiring diagram on page 94 of the 2019 Brattons catalog . This diagram, with the listed color coding makes this procedure fool proof . I use to make my own wiring harnesses . The correctly color coded wiring harnesses offered by the vendors makes this process much easier for the newbe model a person .
 
The replacement wiring harness I would guess are modern (plastic or rubber) type insulation covered in fabric and then fabric loom? I just had to repair a few ends and pretty sure some of the original 90 year old wires were what I was dealing with. Looks like some "modern" wire was spliced into the original harness at the ends where they meet the head lights and horn so thinking based on the condition it is time to make it safe to drive. Dang would hate to watch it burn SAD!!!
 
Replace the wiring harness completely, everything else would be just stupid. I'm facing the same problem right now. My previous owner had already started patching the cables, but it's a very bad job. All cables too thick, the same color, and only patched with the cheapest clamps in between.
What nobody has said here and many do not know ... The cable itself is extremely aged. The insulation becomes fragile and the copper in the cable is oxidized. (Becomes black / green) This has the consequence that the line resistances increase considerably! I only had 3V of the 6V on the battery on the horn and wiper! This means that they can no longer function properly. It won't be much different with the headlights. Furthermore, such a cable heats itself up and, in the worst case, can even burn itself. It doesn't even have to be a loose screw clamp.

As I said, I also have to / want to completely replace my wiring harness, but I will not take one finished. I will make it myself and upgrade the functions that I still lack. (Fog lights, trafficators, HiFi, heater blower, rear window heater ...) And very important, 13 additional fuses !!!

The cable plan for this has also become somewhat more extensive. :eek:
Pic:
http://www.drg-ler.de/Bilder/Ford/Elektrik/aneu1klein.GIF


Greetings from Berlin
Andy
 
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