I converted my 50 Coupe to 12 volt (and later sold it to a guy in Holland who is still very happy with it). Call or e-mail me and I'll walk you through what you need to do the job. In my opinion it's very worthwhile. I've just converted my 41 Coupe which is just a bit harder. It gives you many advantages, BUT there are guys here on the CLC site who will argue against it for some sound reasons. Here are some of the advantages:
1.) If you need to jump start your car or someone elses, you can.
2.) You can use some modern conveniences (cell chargers, computers, radios, Garmins, battery chargers, etc.)
3.) You can use your original wiring harness or replace it with a new 6v harness and still go with 12v, so the authentic look is still there and the wire is heavier.
4.) You can use a Newport two speed electric wiper motor in place of that vac unit and never have to sweat whether or not you vac. unit will work and pass inspection. (You replace the knob that Newport has on their unit with your old knob...same location and it looks stock. No, I don't work for Newport. I just recommend stuff that has worked for me.
5.) You'll have the option of adding modern a.c.
6.) It's been my experience that you increase the marketability of your car when you convert to 12v and if done right, it's really not detectable when the car is shown.
7.) You can buy a 12v battery anywhere. I use Omni types for more power, reliability, and no acid spills.
I see it as a "best of both worlds" solution.
YES, 6v will work very well if you have proper grounds, etc., ( I can hear some of the guys growling as they read this...sounding like a poorly grounded 6v starter.), but it doesn't give you some of the advantages of a 12 system. You have a relatively modern car with a great engine and other design features. 12v just makes sense to me. Cadillac went to 12v in 1953. There were good reasons for that. Stick with your 6v harness if it's in good shape. If not I can recommend at least 3 good sources for a new 6v harness that looks original. In the long run, I think you'll be happy that you converted to 12v.
Ken Karrer 1941 6227D email@example.com