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Flickering Lights


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If headlights are flickering ever so slightly and fast along with dash lights does this indicate there is an alternator/regulator problem? I'm asking this question for someone I know who happens to own a Cadillac.

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Some aftermarket parts houses are equiped to put a load on the alternator and measure various parameters that can indicate a failed/failing alternator components.

If one of you is comfortable using a Voltmeter, you could look at the AC Voltage on the system (at the battery for example) with the engine at idle and a fairly heavy electrical load switched ON; headlamps, HVAC fan, heated seats/windows.

If you measure much more than 0.5 to 0.75 Volts AC, you can be very suspicious of the alternator diode package (one or more diodes shorted).


Drive your car.

Use your cell phone.


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