JW wrote:
If memory serves me correctly, the combination 6/12-volt battery switching was marketed to owners of 6-volt cars who wanted the extra starter boost of a 12-volt battery for starting only, and then run on the 6-volt side after the car started. I believe it was a series-parallel switch using two 6-volt batteries.

I know of one owner who is running modern Saden compressor and clutch on his pre-war Packard. He has a 12-volt battery mounted in the trunk to provide electrical power for the compressor clutch. Says he needs to recharge the battery from time to time, but that it is a satisfactory fix until he can get his original compressor repaired.

More mud for the water.

(o{}o)