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Old 02-27-2006, 08:22 PM
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1946 dodge pickup 6v to 12v

need info on changing from 6v to 12v system, what do i need to do?

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Old 02-27-2006, 09:19 PM
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All your wiring can handle the change, so you don't need to worry about that. But if your wiring is old, of course, this would be a great time to do a rewiring project. I did my 54 Chevy pickup with an EZ-Wire kit and am really happy with it. You can view my project Here

If you're gonna rewire, check out my before-you-start checklist Here

You'll have to change all your bulbs ... and some other things that I'm sure others here with more experience will point out.

And last, I think you'll find my Under-the-Hood mod's helpful -- Click Here and check out my related projects linked at the bottom of the page, as well.

Alan Horvath
54 Chevy Pickup
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Old 03-01-2006, 12:44 AM
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Doc Here,

As Alan has said, the need to replace the stock wire is not required, It will support the Ampicity of the 12 volt system.

HOWEVER, that wire is now 40 to 60 years old! and COTTON clad...wire that old, fuel and oil soaked over that time span, will act just like a fuse when exposed to flame..Cotton wire WILL support a flame. AND: Cotton wire is the favorite junk food of Rodents...(after all, It is a grain..)

If you go a Kit, you have the advantage of installing fuse links and relays where required, and a modern fuse panel.

Things you need to change:
  • All light bulbs (don't forget dash and backup, and tag lamps)
  • Ignition Coil
  • Horn Relay
  • Horns
  • Heater motor
  • Wiper motor (see below)
  • Starter motor (see below)
  • Solenoid
  • Alternator Upgrade
  • remove or upgrade the regulator
  • Cigar lighter element
  • Radio (see below)
  • Turn-signal flasher unit
  • 4 way flasher (if Equipped)

While it is true, you can run a DC motor at 125% in excess of rated value, it will drastically shorten it's life expectancy..(Just when you don't need a starter to fail..) So it's best to upgrade at the time you rewire in my opinion.

If your wipers are Vacuum, consider electrical, lot's to choose from out there, and at least, if you stick with the vacuum, get a vacuum canister to stop the wiper lag on a hill or long pull..

The stock Radio and gauges (any that are electrical) can be run off a system dropping resistor, to keep the retro look..you can score one at auto zombie for under 20 bucks..be sure to mount it outside the cabin and away from heat sensitive sources..Same ALWAYS applies to fuse links.

That should get you started, and Alan's Site..

Doc
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Old 03-01-2006, 01:53 AM
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LOL ... thanks for the kudos, Doc.

And for your most concise additional instructions.

Alan Horvath
54 Chevy Pickup
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Old 03-01-2006, 06:33 AM
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6V to 12V

There is a slick and easy way to do this if all of your 6V accessories (Lights, wipers, etc) are in good shape. Here's what you do.

Install a 12V alternator and a pair of 6V batteries hooked in series like this.

One 6V battery gets its negative post connected to ground (You are a negative ground car, right?). The second battery gets its negative post connected to the first battery's positive post, and its positive post becomes the 12V positive for the alternator. Now, all of the accessories and the positive lead for the fuse box comes off the positive lead of the first battery, giving you 6V to ground. You can use the positive from the second battery, 12V to ground, for your starter solonoid, just be sure to isolate you starter switch from the solonoid with a relay.

Another way to acomplish the same thing is to use a 12V battery with the old lead straps protruding from the top and drill and tap the center strap for you 6V tap.

If this solution appeals to you, I can go into it in some detail later when I have more time.
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