There is no such thing as a proton volt.
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If your 1949 truck is a CHEVY or GMC and it still has the original electrical system, it would be 6 volt, negative ground. If it is a Dodge or a Ford with the oringinal electrical system it would be 6 volt, positive ground.
That would be a ( 12 volt battery ) in the engine compartment of a 1998 Ford Explorer
That would probably depend what you mean with "use with"; for example, connecting two such similar objects, but with different voltages, in parallel doesn't seem safe to me.
The MeV means million electron volts. It's a measure of the energy the energy in the photon, which is a quantum (or specific quantity) of electromagnetic energy. This 1 megaelectron volt = 1.60217646 × 10-13 joules of energy.
Not a good choice but possible. This is a 120 volt AC controlled valve The version with 12-16 volt control would be a much more usable item