Earth points, alternator output and body control module symptoms explained for workshop technicians.
Most Ranger electrical complaints we quote for trace back to three areas: corroded earth points, failing alternators and water ingress at connector blocks.
Start with a voltage drop test across the main earth strap before condemning any module. A 0.4V drop under load is enough to cause intermittent dash warnings.
If alternator output falls below 13.6V at idle with lights on, replace rather than repair — remanufactured units come with a 12-month warranty and are cheaper than repeat labour.
Send us the VIN and fault codes and we will confirm the exact module part number before shipping.
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