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Alternator Fault
The symptoms you describe indicate an alternator fault which has been reported here many times. However the exact cause and reason, as far as I am aware, has not been previously analysed and described.
The dash indicator light circuits incorporate blocking diodes to eliminate a sneak circuit which would otherwise exist. In an event involving faults within the alternator rectifier network, alternating current is induced on line. The result is pulses of reverse voltage which pass the blocking diodes and flash the indicator lights accordingly.
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Trevor, New Zealand.
As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! 
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