It seems like my Red Top Optima is overcharging. It's venting a strong sulfur smell after driving about an hour. Is the voltage regulator build into the alternator? I know the '01 Rodeo alternator (3.2 liter) is a "smart" alternator that has electronics built into it. The casing of the battery seems a little distorted and I could hear it venting after I stopped. I replaced the alternator about 2 years ago after fording some very deep water. The problem started recently. Otherwise, it starts well and runs the winch without any problem (used winch a few days ago).

Thanks,
Pete