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Re: Intermittent tree lights
Quote:
Originally Posted by kwren
Was this the voltage reading at the same time as the Christmas tree was going on. If not, it doesn't count.
If not, when they come on, park right then and leave the engine running and test the battery right then!
Keith  |
I found this post from Trevor, who is an accredited electrical engineer. I found it to be useful.
The flashing of several dashboard trouble indication lights can indicate an alternator fault.
The indicator light test circuit incorporates blocking diodes to eliminate a sneak circuit which would otherwise exist. In an event involving faults within the alternator rectifier network, often involving only a single diode, alternating current is induced online. As a result, pulses of reverse voltage pass the blocking diodes in the test circuit and energize the indicator lights.
It has been shown that testing battery voltage with a multimeter switched to the alternating current range, will usually disclose the presence of the unwanted alternating current, whereas a straight direct current output voltage check may not.
Those who are testing alternators have often failed to detect this problem, as there may be only a small reduction in DC output.
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