High 4 headlight kit?
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, High 4 headlight kit? in Past Cadillac Vehicle Discussion; I know you can get what called a high four headlight kit for Chevy Trucks out of LMC. Basically it ...
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    USA-1 is offline Cadillac Owners Fanatic
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    Question High 4 headlight kit?

    I know you can get what called a high four headlight kit for Chevy Trucks out of LMC.

    Basically it allows all four headlights to be on with brights. I was curious if anyone has done this.

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    rodnok01's Avatar
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    Re: High 4 headlight kit?

    I can tell you how yours is set up... There are 2 relays, one turns headlights on and off the other is were low or high beams are switched. I doubt the current wiring would support the voltage for both being on(at fuse panel wiring). I would tap into the main power wire at the fuse panel for any additional wiring(and fuse it) as to not stress the stock wiring(which is absolutely minimum gauge required already). Wouldn't be that difficult to accomplish.

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    Re: High 4 headlight kit?

    I maybe able to adapt the harness for Chevy Trucks, they also have a heavy duty headlight harness that's fused and relayed and pulls power direct from battery, with larger gauge wire.

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    Re: High 4 headlight kit?

    The 2000 and later Sevilles use four headlamp bulbs - 9006 for lows, 9005 for highs. All 4 burn with high beams. IF the Deville uses 4 bulbs you might get away with a harness/relay jump - but if both filaments are in the same bulb then my guess is that it will overheat and blow in seconds.
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    Re: High 4 headlight kit?

    Both the 9005 and 9006 that are on my Caddy are in the same housing(air space). With both bulbs burning it may generate too much heat.

    But I'm going to replace the two turn signal bulbs with LEDs so that'll cut some heat from inside headlight housing.

    But I just did a Suburban with the same headlight bulbs as my Caddy. Used LMCs heavy duty headlight harness and there high 4 headlight kit. Worked great.

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    MoistCabbage's Avatar
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    All the bulbs in the Seville are in a single housing per side too. There are people running HIDs in your body style Deville with no issues with heat damage. Don't worry about it.

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    Re: High 4 headlight kit?

    Ummm........... maybe single assembly, but two very different reflectors, isolated from one another........... doesn't the Deville have one big lens cover with bulbs in a single space ?
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    He said airspace, I assumed he thought the air inside the housing would get hot enough to cause damage.

    But HIDs run way hotter than incandescent, and people run them in those Devilles with no issues. Running hi and low beams together won't be a problem.

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    Re: High 4 headlight kit?

    ^^^ True.............. Are stock HID bulbs high or low beam ? If they're lows, then they must stay lit during high beam operation due to the arc strike time at switchover.

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    HIDs are low beam only with an incandescent bulb for high beam, unless it's a bi-xenon setup. A bi-xenon housing has just the HID bulb. When the high beams are turned on, an actuator moves the cutoff shield up slightly, making it a high beam beam pattern.

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    Re: High 4 headlight kit?

    Quote Originally Posted by USA-1 View Post
    I know you can get what called a high four headlight kit for Chevy Trucks out of LMC.

    Basically it allows all four headlights to be on with brights. I was curious if anyone has done this.
    Yes. Look for a post by JimD. Might even be in Tech Tips.

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    Re: High 4 headlight kit?

    2000 to 2005 Deville -

    to keep low beams on with high beams -

    you need Radio Shack #276-1101 diodes -

    remove relays #27 and #28
    in the underhood fuse box -

    view if you are standing at the right fender -

    install SILVER end of diode
    in upper left slot of #27 -

    install other end of diode
    in upper left slot of #28 -

    connect the "X"

    X o 28
    o o
    ----------
    X o 27
    o o

    re-install the relays.

    ------------------------------------
    knotgoalie likes this.

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    Re: High 4 headlight kit?

    Thanks basscatt sounds like you've done this before.

    So you use only one diode? Or just double up?

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    Re: High 4 headlight kit?

    Man I hope Radio Shack still in business. Basscatt I only need to jumper one diod, between the two relays?

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    Re: High 4 headlight kit?

    Quote Originally Posted by USA-1 View Post
    Man I hope Radio Shack still in business. Basscatt I only need to jumper one diod, between the two relays?
    ======================
    I only need to jumper one diod, between the two relays?
    correct -

    how this works is that
    the relays for the low and high beams get a "trigger signal" -

    normally - when the low beams are selected -
    the low beam relay gets a trigger signal -
    and the relay sends power to the low beam bulbs -

    when the high beams are selected -
    the low beam relay looses the trigger signal -

    and the high beam relay gets the trigger signal -

    the diode is like a one-way "valve" for electricity -
    allowing current to flow in one direction -

    the RED X represents the trigger signal for the high and low relays -

    #27 is the high beam relay -
    #28 is the low beam relay -

    what the diode is doing is feeding current to the low beam trigger -
    directly from the high beam trigger -

    but - NOT feeding current to the high beam trigger -
    when only the low beam - or daylight running lights - are on -

    ===========================

    keep in mind - I am referring to the 2000 to 2005 Deville -

    the fuse box is different on your 97 Deville -
    you need to find the two headlight relays -
    the connection should be the same -
    baller95 likes this.

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