Weird electrical glitch

[David Brady]

This evening, while driving from Salt Lake City to Las Vegas, I
had a strange electrical phenomenon take place. I was cruising
at 75mph, just crested a 6% grade, engine temp was around 200
deg F, and suddenly I hear a beeping noise coming from my Trace
inverter remote controls, a "High Batter Voltage" alarm. I checked
the dash gauges and found that the alternator amp gauge was pegged
at 300 amps and the DC Volts Coach and DC Volts Engine were
pegged at 16 volts. This condition lasted for maybe 15 seconds.
I pulled off at the next exit ramp and inspected the inverters and
the alternator and load center wiring at the rear of the coach -
no obvious problems existed. The sun was setting so I got back
in the coach, started her up, and turned on the headlights only to
notice that I lost my driving lights. This seems to be the only issue
I've noticed thus far. We then motored down I-15 to Las Vegas using
the high beams. The next 200 miles were non-eventful. Any ideas
on what could have happened?

TIA,
David Brady
'02 LXi, Smokey
Va