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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Aug 2011 Posts: 687 Shop Shark | | Shop Shark Joined: Aug 2011 Posts: 687 | What's the difference? I am running a 6V system now in my 1950 3600. No issues and don't really have a need to change to 12V, but would like to install a new harness during paint. I see the harness from J/C is available in 6 and 12 volts. Is there a difference in wire size?
Thoughts? | | | | | Joined: Sep 2009 Posts: 433 'Bolter | | 'Bolter Joined: Sep 2009 Posts: 433 | 6 volt wires are larger... I kept mine 6 volt...
1954 Chevy 3104 3 Window Hydra-Matic in my family for over 60 Years
Once in a while you get shown the light in the strangest of places if you look at it right... "Scarlet Begonias" Grateful Dead 1974
| | | | | Joined: Aug 2011 Posts: 835 Shop Shark | | Shop Shark Joined: Aug 2011 Posts: 835 | Even if you are going 12v, you might want to use the 6v harness as the wire size is larger.
Kurt | | | | | Joined: Sep 2006 Posts: 3,596 'Bolter | | 'Bolter Joined: Sep 2006 Posts: 3,596 | Buy the 6-volt version and you will be covered both ways. Often the decision to go with 12 or 6 is what people use the truck for. So if you are looking to add accessories or modern systems like heating/ac etc., that may be something to consider. You have to ask what you want the truck to do? | | | | | Joined: Aug 2011 Posts: 687 Shop Shark | | Shop Shark Joined: Aug 2011 Posts: 687 | Thanks folks. Brad, how ya been? I'll keep cranking along with the 6V. I see classic has a harness for $150. harness Seems like it would work. I think the time to do this would be during paint as the dash will be dissembled anyway. Thanks. | | | | | Joined: Mar 2011 Posts: 940 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 940 | I used the $150 harness from Classic Parts and when it arrived the sticker on the bag said it was for both applications.
Basically a harness intended for 6v makes a heavy duty 12v harness since the wire used for 6 is thicker/heavier. So should you ever want to switch, you've already done the wiring work. | | | | | Joined: Aug 2011 Posts: 687 Shop Shark | | Shop Shark Joined: Aug 2011 Posts: 687 | Thanks. Pretty straght forward? I'm guessing a few hours of work. | | | | | Joined: Sep 2006 Posts: 3,596 'Bolter | | 'Bolter Joined: Sep 2006 Posts: 3,596 | I bought that harness for my truck and it works great. I did convert to 12-volt and I have had zero issues. It does not take that long and it comes with pretty good directions. My advice though is take your time make all the connections perfect, make all your runs supported and well protected, heat wrap all the wires where they go into the connectors and when you are done you won't be sorry. Time to do it right is now because as we all know getting up under that dash is no fun. | | | | | Joined: Mar 2011 Posts: 940 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 940 | Took 2.5-3 days on my '51. One to gut the old stuff, another to install the new stuff along with cleaning up any rusty grounds and the final to troubleshoot, find some stuff locally and fix. I went slow and double checked everything. Here's the blog entry from when we did mine. http://rustyfiftyone.com/2012/07/09/let-there-be-light/ | | |
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