Voltage regulation not working, voltage gets too high for whatever you've plugged in? If so, it should also die at lower speeds in lower gears.
Pop up the cluster diagnostics (see wiki) and take a look at the battery voltage when the problem occurs. If it's over 14-15V, something is wrong.
Pop up the cluster diagnostics (see wiki) and take a look at the battery voltage when the problem occurs. If it's over 14-15V, something is wrong.
