Perhaps the greatest weakness in the electrical system of older cars is the bulkhead connector that connects the engine compartment to the rest of the car. Unlike modern bulkhead connectors, these old connectors were not sealed – this leads to corrosion in the connector which increases resistance, reduces voltage, and leads to a wide range of problems.

The problem is made even worse by undersized wiring which is also corroding and likely to have cracking insulation.
Imperial bulkhead connector

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