Oops. I'm still figuring out how to safely disconnect the charger as there's no on/off switch and at some point it seemed to indicate that I should have the "ignition" key turned on.
Anyway, after a bright flash I have no peripheral electronics -- lights, horn, signals. The ignition switch itself seems to be working, although it's a bit intermittent. When I turn the key I have to wiggle to get it to display the voltage on the meter.
So I have two questions...
1. What is the correct way to disconnect the charger and...
2. How can I fix my problem?