Results 1 to 6 of 6

Thread: Koito Headlamp Voltage Rating ~ electrical gurus please help!

  1. #1
    Registered User
    Member ID
    CZCC-24523
    Join Date
    Jun 2011
    Location
    Canada
    Posts
    56

    Default Koito Headlamp Voltage Rating ~ electrical gurus please help!

    Hello all! Purchased a pair of brand new Koito Headlamp Sealed Beams from my Nissan dealer and they are marked on the back 6024LH and rated at 24V 75/55W. My original headlamps are marked 6012 and are rated at 12V 50/40W. Could someone in the know please explain what the difference is and any compatibility issues there may be whatwith the different voltage rating. The microfiche suggests that this new pair is compatible with its former number, part number 26705-89905. Any input would greatly be appreciated.
    Last edited by redzedsled; 11-05-2013 at 10:28 PM.

  2. #2
    Registered User
    Member ID
    CZCC-24523
    Join Date
    Jun 2011
    Location
    Canada
    Posts
    56

    Default

    Well it's been at least 2 hours now, so I thought I would respond to my own post. I scoured all Factory Service Manuals from 70-78 Z cars and all FSM's indicate that the correct replacement bulb is in fact the 6012. Apparently the 6014 bulb replaced the 6012 with a rating of 60/50W at some point, but not sure on that one.

    Aftermarket bulbs now use the H6024, but all seem to be rated at 12V. I kind of expected an "Ohm's Law" beatdown with this thread, but no one has chimed in as of yet. Getting more confused by the minute...
    Last edited by redzedsled; 11-06-2013 at 12:00 AM.

  3. #3
    No more body roll! SteveJ's Avatar
    Member ID
    CZCC-5413
    Join Date
    Dec 2003
    Location
    Gainesville, GA
    Age
    54
    Posts
    3,651

    Default

    Well, you could go over to Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z and look up user h4lights. He will be able to address your questions.

    Searching a little bit more, it looks like if the bulbs were designed for a 24VDC circuit, you probably will get little light output on a 12VDC system.
    Last edited by SteveJ; 11-06-2013 at 04:47 AM.
    73 240Z
    74 260Z

    Blue's collection of tech tips - A great place to look for answers
    XenonS30 -The cheap source for FSMs
    Georgia Z Club
    Fiddling with Z Cars - Z car tips & tricks and pictures of my car-loving life.
    Steve's CARtography - Just car pictures.

  4. #4
    Registered User Jetaway's Avatar
    Member ID
    CZCC-16944
    Join Date
    May 2008
    Location
    Manteca, CA
    Age
    61
    Posts
    382

    Default

    Quote Originally Posted by redzedsled View Post
    Hello all! Purchased a pair of brand new Koito Headlamp Sealed Beams from my Nissan dealer and they are marked on the back 6024LH and rated at 24V 75/55W. My original headlamps are marked 6012 and are rated at 12V 50/40W. Could someone in the know please explain what the difference is and any compatibility issues there may be whatwith the different voltage rating. The microfiche suggests that this new pair is compatible with its former number, part number 26705-89905. Any input would greatly be appreciated.
    No real help here redzedsled, but I am curious if you tried the 6024LHs. Plugging them in wouldn't hurt the electrical system, but you shouldn't get much light out of them. I calculated down and dirty 18 to 20 watts, which wouldn't produce much of a glow.

    The other thing that puzzles me is the 24V rating. I remember reading four or five years ago that 24V was the 'next thing' for automobiles because of less power loss due to resistant and weight savings because thinner wire can be used for conduits and in motors. Plans were apparently abandoned in mass because 24V is much, much, more likely to arc -- painfully or dangerously or both.

    Chris

  5. #5
    Walmart greeter Mikes Z car's Avatar
    Member ID
    CZCC-18366
    Join Date
    Dec 2008
    Location
    Idaho
    Posts
    1,041

    Default

    Thanks Chris, I had heard about the 24V idea for cars being looked at and then it never materialized.
    I wonder if the box was made in anticipation of selling 24 volt headlights? The 6024 bulbs I see on the net are rated for 12 volts. The LH after the 6024 just means low beam high beam I assume.

  6. #6
    Registered User
    Member ID
    CZCC-2148
    Join Date
    May 2002
    Location
    Phoenix, Az
    Posts
    690

    Default

    I just noticed this thread for the first time. I have a pair of "new-in-the-box" Koito bulbs marked 6024LH, as well. But, the important
    information is on the boxes. The part number on the boxes is "02260-231KO". Checking this part number on my trusty parts CD shows
    this number to be good up to 07/73 for our cars.

    Hope this helps.

    Dan
    Original Owner/1971 240Z
    Gold Medallion/First place Stock Class/2012 ZCON

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Measuring voltage VERSUS Voltage Drop
    By Wade Nelson in forum Electrical (S30)
    Replies: 4
    Last Post: 09-19-2012, 07:46 AM
  2. koito bulb
    By kats in forum Electrical (S30)
    Replies: 6
    Last Post: 04-07-2004, 07:52 AM
  3. Koito Headlights
    By daddz in forum Electrical (S30)
    Replies: 17
    Last Post: 01-05-2004, 02:43 PM
  4. Electrical gurus needed
    By Shakey in forum Electrical (S30)
    Replies: 1
    Last Post: 08-24-2003, 05:49 PM
  5. HP rating
    By Rick in forum Open Discussions
    Replies: 0
    Last Post: 02-09-2003, 05:47 PM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •