I bumped the wire coming out of the alternator and the outer insulation cracked and fell off.
Is this usual for this age of car?
I dare not touch the individual wires in case their insulation is perished too.
What causes this?
What can be done about this?

 

Usually the reason the insulation goes bad is excessive heat.

It could be due to engine compartment heat or most likely the wire coming off the alternator carrying hi current for a long period of time.

The vehicle charging system is usually designed to replenish what is taken out of the battery on starting and provide the NORMAL current for normal vehicle loads and operation. It was not designed to be charging a dead battery,which should be done with a battery charger.
If there is something added that causes the alt to constantly be putting out full current or a problem with the charging system it can cause that wire to overheat.

If you can, try to make sure that wire has insulation protection because it connects directly to the battery positive post.
As long as the battery cables are connected to the vehicle that connection has full battery power, so be careful when working around that connection to not allow any metal to provide a path from that post and wire to ground. The wise thing to do is remove the battery ground cable before attempting any repairs there.

 

Bumping the wire coming out of the alternator and experiencing cracked and falling off outer insulation can occur with cars of various ages, as it depends on factors such as wear and tear, environmental conditions, and the quality of the materials used in the wiring. In general, the outer insulation of wires is designed to withstand the vehicle's operating conditions, but over time, exposure to heat, vibrations, and other stressors can lead to degradation.

For a car of a certain age, like a 2003 model, it's not uncommon to see signs of aging in the wiring. However, the rate of deterioration can vary between vehicles based on maintenance, climate, and overall usage. Regular inspection of the wiring harness, especially around critical components like the alternator, is a good practice to identify and address potential issues early on.

If the outer insulation has cracked and fallen off, it's crucial to address this promptly to prevent further damage and ensure the proper functioning of the alternator and associated electrical components. Repairing or replacing the damaged section of the wiring harness may be necessary. Consultation with a professional mechanic or automotive electrician is recommended to assess the extent of the damage and determine the most appropriate course of action.

In summary, while it's not unusual for the outer insulation of wiring to degrade over time in a 2003 car, the specific circumstances and severity of the damage should be assessed by a qualified professional to ensure the continued reliability and safety of the vehicle. Regular maintenance and proactive inspection can help catch such issues early and prevent more extensive damage.

 

Spotty , if you decide to read this,
Please let us know if you did anything or are contemplating any self repairs.
We should be able to advise you what you need and.or what you can do to just about eliminate the problem which is really the result of something we do not at this time know.
A little curious if you don't mind, what brought you to this area that you became involved?
Just putting a band aid on a problem is a short term fix and usually doesn't last.
Thanks.