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When did CJ-5s switch to 12 Volt?

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UPDATE:  Thanks everyone!

Brian asked me if I knew when CJ-5s switched to 12 volts.  I couldn’t find the answer online, so I was hoping someone might know?  He has a 1956 that is 6 volts.

 

6 Comments on “When did CJ-5s switch to 12 Volt?

  1. Craig B.

    I’m pretty sure the switch came during the 1957 model year. Many ’57’s came 6 volt but I believe that late in the year they switched over to 12 volt.

  2. modmike

    Yes, I agree that within the 1957 model year the change over was made. I used the Willys America parts list book as a reference.

  3. Dave

    Taking the information from the “Standard Catalog of Jeep 1940-2003” by Patrick Foster—
    “By 1958, 12 volt electrical systems had become standard equipment in Jeep vehicles.”
    As I remember, the 6 volt system was an option for several years after that, but I don’t have any idea when that was dropped from the option list.

  4. Ron Damron

    Dave-

    I restored a 1957 Willys CJ-5 for my brother back in the mid 70’s and it had a 6 volt charging system. If my memory serves the late 57 year CJ’s converted to 12V. My 1956 CJ-5 had a 6V system when I bought it and I converted it to 12V and upgraded to a GM 1 wire alternator. Pain in the butt to wire up seeing as I’m hefty and don’t fit under the dash easy.

    Ron

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