1956
1967 first year for 12 volt
If that 1940 Chrysler is in original condition, it would have a 6 volt system. Originally, it was a 6-volt. However, many people convert them to 12-volt systems for convenience purposes.
1954-1955
No, the voltage rating of the switch is too low.
Two six volt batteries in series makes 12 volts so switch the charger to the 12 volt position.
The RV has a 12 Volt DC power supply that operates all the 12 Volt DC items in your RV when your plugged in to 110 V AC.
1967 was the first year for the 12 volt system in the VW's.
Any 12 volt car battery can go into any modern car. so yes
In the switch itself...
No and yes. A 120-volt plug-in timer connects the line voltage to the timer and to the switch that is operated by the timer, so you can't use it directly for a 12-volt light.However, if you use the timer to supply power to a step-down transformer, you can run a 12-volt light off the transformer (that's how most low-voltage landscape lighting timers work). If you don't need much current, you could even plug a 12-volt AC adapter "wall wart" into the timer. Otherwise, you would have to open the timer and modify it so that the micro switch is completely isolated from the 120-volt supply and bring it out to connectors for a 12-volt supply. Make sure you know what you're doing and also don't exceed the current capacity of the switch.
No, you cannot use a 10 amp switch to open a window in a 12 volt DC system. This is because the switch would not be able to handle the current necessary to power the window motor. The amount of current required to open a window in a 12 volt DC system is typically much higher than 10 amps, and so the switch would not be able to cope with the load. In addition, the switch would not be able to sustain the current necessary to keep the window open, which could lead to the window becoming stuck in the open position. Furthermore, the switch would not be able to handle the circuit protection requirements necessary to keep the window safe. For these reasons, it is not recommended to use a 10 amp switch to open a window in a 12 volt DC system.