Replacing the wiring loom

On a drive just out of town a few days ago there was a slight waft of burning plastic, and a puff of smoke from the glove box behind the steering wheel. It turns out that for some reason whenever I turned on the lights, the wiring loom would begin to self destruct, melting, and shedding it’s insulation, presumably filling the cabin with toxic fumes. I could’ve probably chased the problem and patched it up somehow, but as it would be difficult to assess the full extent of the damage caused without cutting up the loom, and with wires in both the glovebox and boot being stripped bare, i figured the best course of action was to replace the entire wiring loom.

Firstly I set about taking photos of the fuse box and voltage regulator so I knew where the bulk of the connections terminated.

Stripping the loom out was relatively easy, although when it came to threading it all through the bulkhead to remove it, I opted to cut it in two.

The old loom stripped-out. Note the red wire towards the bottom right of the photo, which had burnt through.

…unfortunately I made the mistake of ordering a new loom used in cars between 1965-1970, when my car was registered in January 1964, which meant that some of the wires were different colours to those in the loom I was replacing, and some of the terminals were different.

It was not immediately clear where everything went, so this turned into a task that took me a few days to figure out.

Handfuls of wires everywhere.
Here I am attaching the lights that illuminate the speedometer face, and the ignition/oil pressure lamps.
Attaching the new loom to the inside of the boot-lid, where it runs to the number plate light. I think this is where the original loom started to burn through.

Eventually, with the new loom in place I turned the key, and as you might expect from someone who has never worked on cars in any real capacity before… nothing happened. But why?

After a few more days of tinkering, and probably filling-up the Morris Minor Owners Facebook page with various questions about all different connections and wire colours, sourcing several different conflicting Morris Minor wiring diagrams in the process, I resorted to enlisting the assistance of a local auto electrician, who was able to determine that the fault – simply a problem with the ignition unit. I may have damaged this component when I (rather stupidly) started disconnecting various parts of the loom without first disconnecting the battery. Maybe not the smartest move.

As luck would have it, there is a shop not too far from me which had the replacement ignition component that I required, so I was able to rectify this relatively quickly.

The new ignition unit, fitted to the existing distributor.

And sure as anything, the car started after this. Huzzah!

It was a bit of a task, but it was satisfying to get the car working again after all of this. It might not be the neatest job, but it saved me a few quid and more importantly It was valuable to gain more of an understanding of which wires go where.

The first breakdown

A fairly regular sight

Looking back at this one, this was just daft, and something that probably could’ve been easily avoided had I known more.

On 16th September 2015 I encountered my first breakdown requiring recovery. Again, at this point I knew absolutely nothing about how a car worked, or what made it go, so when I called roadside assistance and they told me it was a recovery job, as they believed it was a blown head gasket, I took them at their word… it actually turned out to be a blocked air filter, which could be replaced for around £5.

The paper air filter on the Morris Minor is situated right above the manifold/exhaust clamp, and if it’s not sealed correctly then there is a chance that the exhaust fumes are being sucked through the filter.

The filter was covered in soot, so after some research I replaced it and was on the road again.

Collection

On 13th September 2015 the purchase of the car went ahead, and ‘Molly’ the 1964 rose taupe Morris Minor was mine. First of all I had to work out how to start it!

The four door saloon was first registered in Kelvedon, Essex on 22nd January 1964, and has belonged to four owners prior to myself. The last owner, a Ms. Hall from St Albans had owned the car for the last 15 years.

Viewing the car

The viewing.

On 3rd September 2015 I went to view what would soon become my first car, after finding it on a classic car auction site.

As it was fairly close to home, a friend of mine drove me to St. Albans in her 1974 Volkswagen Beetle.
I had a look around the car and couldn’t see anything immediately obvious that needed doing, although I wasn’t exactly sure what to look at on a car, especially one of this age.

The motor had an MOT, the owner took us for a spin around St Albans, and my friend -who claimed to have at least some experience in restoring classic cars- assured me it was in decent condition.

It seemed to drive pretty well, surely it wasn’t so bad!

As somebody with no mechanical or car-related knowledge at the time, I was relying on my friend’s advice to be fairly sound and at least based on something, but I later found out that this was completely incorrect, and it was more of a case of there not being much right with the car at all.