Hi guys, before Christmas, running around in the van I noticed we were getting a strong rotten egg smell from the van. Battery was hissing and thought, "Hey the battery is cooked." It was over 3 years old and the indicator said it was dead so I replaced it with a new Century battery in the Boxing Day sales and all good again. Down the Great Ocean Rd for a few days, starting to notice rotten egg again on the way home, not as strong, but could hear a slight hiss from the battery when parked up. Checked the voltage in the system whilst driving using the dashboard app from my 123 TUNE. Voltage was sitting up at 15 Volts while engine running. (That's the max that the needle on the digital gauge goes to) Got home and checked with a multimeter. 16.5 Volts on the battery when engine idling, 13.8 in the battery when ignition turned on. That's out of spec from what I understand! I had my suspicions when I blew 2 sets of bulbs in quick succession before Christmas - faulty voltage regulator? Is there anything else it could be?