Had a guy bring one of the work trucks to the shop. Had to jump start it that morning. As soon as he turned the truck off I heard a whistle. Opened the hood and saw one of the batteries was making the noise. It was blowing steam out the vent.
I promptly walked away from it. After about 20 minutes I dawned goggles and a face mask and disconnected the other battery.
A minute or so later the whistle stopped.
I'm guessing that the battery was shorted internally.
It was very hot. After I replaced both batteries the charging system checked out ok.
The batteries were 4 year old from the local battery mart . Pretty good battery life for those here.
I put in some duralast ones from AutoZone.
I promptly walked away from it. After about 20 minutes I dawned goggles and a face mask and disconnected the other battery.
A minute or so later the whistle stopped.
I'm guessing that the battery was shorted internally.
It was very hot. After I replaced both batteries the charging system checked out ok.
The batteries were 4 year old from the local battery mart . Pretty good battery life for those here.
I put in some duralast ones from AutoZone.