In the interests of science I have been busy in the lab.
(1) Ignition on, no 660 in cradle, ignition off. Lights flash - see film (breezy here by the Thames) flash at about 1:03
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(2) Ignition on, 660 in cradle, ignition off. Leave 660 in cradle. Lights do not flash, or at least do not seem to.
(3) Ignition on, 660 in cradle, ignition off. Leave 660 in cradle for, say two minutes then remove. Lights flash (see 1 above)
(4) Ignition on, no 660 in cradle, engine fired up, ignition off. Lights flash (see 1 above)
(5) Ignition on, 660 in cradle, engine fired up, ignition off. Leave 660 in cradle. Lights do not flash.
(6) Ignition on, 660 in cradle, engine fired up, ignition off. Leave 660 in cradle, for say two minutes. Remove 660. Lights flash. (See 3 and 1 above).
Clearly the presence or absence of the 660 in its cradle dictates whether or not the lights flash after the ignition is turned off. Why