Hy GMC4Life, I believe your truck is positive ground, so be careful how you hook things up. There is no "need" to convert to 12 volt, however things like 12 volt negative ground alternators are plentiful and cheap, and 6 volt positive ground ones are scarce and more expensive. It is up to you whether to convert or not, a lot depends on what you want to use the truck for, good luck.