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Thread: Headlight Wiring 72'

  1. #1
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    Default Headlight Wiring 72'

    Okay! So to start, I can't read those stupid wiring diagrams worth a flip. I have come across a low grade HID conversion kit for my headlights. Each headlight works individually, but when I hook them up simultaneously, they flicker back and forth. I have decided to wire relays into the original circuit and route wire straight from the battery to each of the headlights. Problem is, I don't understand how the brights even work. . What I'm asking for is a walkthrough of the wiring from the battery, through whatever switches, and to the headlights. High beams and low beams. Stock setup. I can't seem to find anything descriptive on this matter. If you do know of a walkthrough, a URL would do fine. If not, once I gain a sufficient understanding, I will post a thread myself. Thank you!
    Last edited by jwilliams7200; 08-12-2014 at 08:56 AM.

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    No more body roll! SteveJ's Avatar
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    Look at the drawing for the 260Z circuit. The wire colors are the same, but the connectors and fuse locations are a little different.
    The W/R wire comes off the battery/alternator and goes to the headlight switch. It comes out as a Red wire. The R wire goes to the left & right headlight fuses and comes out R for the right headlight and R/Y for the left headlight. There are two wires that come off each headlight and go back to the high/low beam switch. The R/W wire is for the high beams, and the R/B wire is for the low beams. The switch determines which of those two wires is connected to ground.
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    73 240Z
    74 260Z

    Blue's collection of tech tips - A great place to look for answers
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    Thank you for your reply, Steve. Didn't think I'd get one, haha. I will reply with more questions or a conclusion on Thursday.

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    No more body roll! SteveJ's Avatar
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    Be sure to search on this site, too. There are plenty of posts on headlights.
    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.

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    I would highly suggest either buying the Dave Irwin harness from MSA or build your own like I did ... Dave's 1972 Datsun 240z: Headlight wiring harness with relays
    Dave
    Windy City Z Club (Chicago)
    1972 240z, restoration in progress
    http://jarvas240z.blogspot.com

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    Well, a little later than Thursday, my apologies. I figured out that my battery was just bad, so that's why I could never get the ballasts for the headlights to operate simultaneously. Fixed that, problem solved. Thanks a lot for the diagram and explanation, Steve! I'm gonna do what Jarvo says and build my own relay harness using that guide.

  7. #7
    No more body roll! SteveJ's Avatar
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    One nice thing about buying Dave's relay harness (via Motorsport Auto) is that it's plug and play. I would suggest going that route.
    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.

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