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Thread: anyone try running 6v fog lamps on a 12v system?

  1. #1
    PCaricous Fanaticous G50911's Avatar
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    anyone try running 6v fog lamps on a 12v system?

    i picked up a pair of NOS hella 128's but they're 6v. my 67 is a 12v system and i'm wondering if anyone did this conversion? i read somewhere you can put in 12v bulbs but also vaguely remember i need a resistor or something to make it work. anyone do this? or can anyone chime in with suggestions?
    Last edited by G50911; 02-28-2022 at 10:36 AM.
    1967 911 - #308439
    1971 911 - 3.6 hotrod aka Vader
    1989 911 - Carrera Cabriolet

  2. #2
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    I have not done this on a Porsche, but I did do it on my Willys Army Jeep.
    The lights were incredibly bright for about an hour before they both burned out. I'm not saying this same thing will happen to your Hella fogs, but it's possible.
    I am certain other guys will know more.
    Jay
    1946 Willys Army Jeep
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  3. #3
    Righteous Indignation 70SATMan's Avatar
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    Usually it's driven by the capability of the bulb and if you can source the correct 12V bulb for the reflector base then, I see no reason whey you'd need to do anything else.
    Michael
    “Electricity is really just organized lightning”

    -Dusty 70S Coupe
    -S Registry #586

  4. #4
    ^^^^^ my thoughts as well
    Peter Kane

    '72 911S Targa
    Message Board Co-Moderator - Early 911S Registry #100

  5. #5
    Senior Member moito's Avatar
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    if you use 12V bulbs you are fine..nothing else needed

  6. #6
    PCaricous Fanaticous G50911's Avatar
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    thanks for confirming and feedback guys. i’ll pick up some 12v bulbs and maybe a relay.
    1967 911 - #308439
    1971 911 - 3.6 hotrod aka Vader
    1989 911 - Carrera Cabriolet

  7. #7
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    Do the relay, it was in place on factory fog set up, while you are at it add headlight relays to pull more power (amps) out of the headlight switch for longer life and safety.

    Regards

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