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Old 12-21-2014, 01:42 PM
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svxcess svxcess is offline
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Re: Christmas tree lights?

This may be of some help. One of the many articles I have collected over the years.

Has proven itself more than once.


Alternator Fault / Flashing Dash Lights

Intermittent dash light indication

Steady simultaneous illumination of more than one dashboard trouble indication lights, i.e. Battery Charging, Steering, and Stop Lamp, indicates one of several possible alternator faults which can be detected by the alternator’s integral electronic diagnostic module.

It would appear that as a safety measure, in the event of an alternator fault those indicator lights which are not illuminated for test purposes at startup, are operated simultaneously.


Flashing dash lights

The flashing of several dashboard indication lights can indicate a rather obscure alternator fault.

The indicator light test circuit which operates at startup, incorporates blocking diodes to eliminate a sneak circuit which would otherwise exist. A fault within the alternator rectifier network, often involving only a single diode, can result in alternating current being induced on line. As a result pulses of reverse voltage, pass the blocking diodes in the circuit which energizes the indicator lights.

Those testing alternators, including professional technicians, can often fail to detect this problem, due to there being only a very small discrepancy in the DC output.

It has been shown that testing battery voltage with a multimeter switched to the alternating current range, will often disclose the presence of the unwanted alternating current, whereas a normal direct current output voltage check will not. An oscilloscope will certainly disclose the problem.



Hope this may be of some use.

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Attached Files
File Type: doc Alternator Fault- Flashing Dash Lights.doc (28.0 KB, 221 views)
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