The other night I installed the new battery in the Triumph. Last night, I actually took it out for a test ride. Currently, the "Check Engine" light is on. I believe this is just because the battery died, and I've got to do 3 heat cycles before it will shut off. I've got two out of the way.
If it's still on tomorrow morning, I'm going to freak the hell out.
Incidentally, old school mileage counters are superior to the new computerized displays because if the battery dies, the trip odometer doesn't get cleared...
Update 7/30: The check engine light is off again. Hooray for engineers and their curious solutions to simple problems - without them the world would be significantly less interesting.