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Well, first let me say this, you should do it the right way. Mismatching the electrical systems can overload the 6v system. A proper charge on the 6v is the way to go. But then again, and I can't believe I am going to admit this, we have an old '51 F5 dump which is a flathead V-8 with 6v electrical system. It hasn't been good since throwing a rod sometime in the 80's. To start the beast, we used to unhook the 6, put in a 12, start it and then throw the six back in to run it! No ill effects that I can recall...FWIW. You don't want to crank it a lot or leave the key on or you will most likely burn stuff out.
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