Headlight relays
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, Headlight relays in Past Cadillac Vehicle Discussion; Hi, I posted this question in the electrical section, but received no responses so I will try it here too. ...
  1. #1
    Garys's Avatar
    Garys is offline Cadillac Owners Fanatic
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    Headlight relays

    Hi, I posted this question in the electrical section, but received no responses so I will try it here too.

    In an effort to boost headlight output, I was considering the installation of relays on my '68 Cad. Basically running power directly from the alternator/battery to the headlights through relays, using the stock light switch to activate the relays. I was going to install H4s, but was afraid it would be too much for the headlight switch. Plus, if I can achieve 13.5 volts to the stock lights (10.5 now)after installing the relays, I may not have to change out the lights. Anyone have any experience with the end result? Thanks!

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    deVille33 is offline Cadillac Owners Connoisseur
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    Re: Headlight relays

    I don't know why you would do this. The switch and the dimmer switch are hot leads to the head lights with only the fusible link as resistance. Check all your connections for possible corrosion before causing yourself more headaches. You could run the dash and interior lights on a seperate circuit if you are concerned about overload on the original switch. That is the only use of the built in rheostat.
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    The-Dullahan is offline Cadillac Owners Master
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    Re: Headlight relays

    ^This.

    If you are still concerned about output, yes, you can upgrade to H4 bulbs, HID lights or even LED housings, like those used to retrofit older Semi trucks if you choose.

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    Garys's Avatar
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    Re: Headlight relays

    I had to look, but did find an article on it. Seems easy, and straight forward.

    http://www.chevyhiperformance.com/ho...7/viewall.html

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    Re: Headlight relays

    After reading a recent post on our forum about LED headlights I have become very interested and will probably put them in my car at some point. Here is a link to a couple of options that may work for your 68 Cad:

    http://www.jwspeaker.com/products/he...product=500051

    http://www.jwspeaker.com/products/he...product=100126
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    Re: Headlight relays

    Relay power feeds are very common now for older cars. GM used marginal wiring, and full power goes through the switch. Relays will not only give you much more useable light, it will be safer. You can make your own harness, or buy pre-made for under $100.
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  8. #7
    Garys's Avatar
    Garys is offline Cadillac Owners Fanatic
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    I will check into it further but it sounds like a good solution. I did clean all the connections when I installed the Silver Star Halogens, I did see improvement, but the lights are still yellowish. I looked at a wiring diagram for my '68 and did note that all the power for the headlights is in fact routed through the switch. I was concerned about installing higher wattage H4s in it for fear of ruining the switch, our melting the wires.

    Quote Originally Posted by jayoldschool View Post
    Relay power feeds are very common now for older cars. GM used marginal wiring, and full power goes through the switch. Relays will not only give you much more useable light, it will be safer. You can make your own harness, or buy pre-made for under $100.

  9. #8
    jayoldschool's Avatar
    jayoldschool is online now GM RWD V8 addict
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    Re: Headlight relays

    Do NOT run higher wattage bulbs on stock wiring! You must use a relay setup.
    The-Dullahan and The-Dullahan like this.

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