While driving, the AT oil warning lamp, the brake warning lamp and the battery warning lamp all illuminated together. I disconnected the battery (for 3 months while traveling) and today reconnected it. The car started right up but still all three warning lights are illuminated.

The car drives perfectly and I know that the transmission oil was cold, the brakes are perfect, the battery is fine. Is this an electric short or related to the alternator? The car has 90,000 miles on it. Where do I begin?

Replaced the alternator & all fine.