I have no idea what may be causing the lights to flash, but it's not a fuse,
since a blown fuse would leave you in darkness, since there's no connection
from the power source (battery) to the lights if the fuse blows.
I think I remember having this same problem. If I remember correctly, one of
the bulbs was partially blown (either the steady-on or blinking filament was
burnt out). Check the bulbs. If I'm right, great. If I'm wrong, you've
wasted 5 or 10 minutes.
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