27 Oct 2021
Matt Masters is back for the next installation in his rotating electrics focused Expert Edition pieces. This time, he’ll be taking us through alternator diagnosis and what to look for in order to ensure you make the right call. For more on our alternators and the rest of the NAPA range, you can contact the NAPA helpline at 03333 136597 to talk to a member of our technical support team.
When it comes to alternator faults, misdiagnosis is common among both experienced and inexperienced technicians. A misdiagnosed alternator can lead to costly replacements or even a warranty rejection, both of which can spell frustration for technicians. If you would like a better idea of how to accurately diagnose alternator problems, NAPA has you covered.
The ignition warning lamp can respond to an alternator fault in three distinct ways:
If the warning lamp does not illuminate:
If the warning lamp stays on:
If the warning lamp glows:
Possible reasons for an alternator failure can include:
If your battery goes flat, it could indicate a parasitic load draining charge even when the vehicle is off. Excessive load due to accessories, lamps or other electric devices remaining powered should also be investigated along with the alternator
During NAPA warranty inspections, alternators are visually inspected, bench-tested and component tested if necessary. If no manufacturing defect is found, you will receive a report explaining our inability to credit your return.
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