Should I switch to 12 volt?

[jdp8402]

I'm trying to decide if I should go to 12 volt or not. What all needs to be switched if I decide to do it. I switched my Farmall H over and all I had to change was the bulbs and coil. I replaced the coil because I didn't want the resistor. The reason I'm thinking about switching is because the generator needs rebuilt and if the battery dies on me somewhere no one drives a car that runs on 6 volt for a jumpstart. I would also want it to be a negative ground. What do you guys think?

Thanks,
Jeff