We charged 8 12 volt batteries connected in series/parallel for 24 volts for cold room tests. We would check all the battery cells using a hydometer before installing in a vehicle. Then we would cold soak the vehicle for 24 hours at -50 F. Once we were at this temp we would pull the batteries at this temp & let them thaw for 24 hours before charging. This was on an M60 Tank. They weren't good at starting at that temp. We did a Soviet tank to -65F and used the same batteries for 3 starts. It was their preheat system that made the easy starts. Hal PS: Here's a hydrometer like we used. They gave me this when I retired.
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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