(I'm still wondering!) Can someone tell me when the 1/2 ton trucks were first produced with 12 volt systems? I have heard '55. But if so, was it with the beginning of the second series? Or was it not a set date at all? (I have a mostly restored '54 3100 which is 12v, but no way to reach previous owners who did the work.) I'm wondering if they might have put in a complete engine starter etc. from a later model? Thanks a lot.