ABS System Failure
Having just gone through the process of replacing the stop light switch... Ah but this is about your problem, not mine. A couple of questions:
Is alternate flashing fast, 4x per second, or slow, 1x per second):
Are you absolutely sure that the braking system was not damaged in the incident, like a hose nicked, or a fitting broken loose?
Usually, the alternate flashing lights are a signal that teh fluid id low in the ABS system. This resevoir has no vivual check as it is contained within the ABS block under teh seat.
2004 K1200RS -- being nursed back to health.