'76 Cadillac (500 cu in) Oil Pressure switch location
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, '76 Cadillac (500 cu in) Oil Pressure switch location in Past Cadillac Vehicle Discussion; Hi, Could one of you point me in the direction of where the oil pressure switch is located on my ...
  1. #1
    Jbmoffo's Avatar
    Jbmoffo is offline Cadillac Owners Member
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    '76 Cadillac (500 cu in) Oil Pressure switch location

    Hi,
    Could one of you point me in the direction of where the oil pressure switch is located on my 76 Coupe de Ville? I am referring to the switch that connects to the "idiot" lights on the dash board....
    I know there is a coolant switch and a STOP ENGINE switch as well....if anyone has a diagram of where they ALL are located, it would be helpful as I don't think the service manual has a diagram of their locations!

    Thanks!

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    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
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    Re: '76 Cadillac (500 cu in) Oil Pressure switch location

    The oil pressure switch is located on the rear of the engine sticking up. You can see it sitting on a fender and looking in between the firewall and center rear of the engine. It should have a black plug with 3 female spade connectors. 2 power the electric choke and one for the idiot lamp. IIRC the center pin is for the lamp. It completes ground with low or no pressure. Goofy engine ground problems can make the oil pressure lamp filcker dimly.

    There's a speciality socket designed for replacing these switches. A regular socket will not work and there's no room to swing pliers. You don't want to use pliers anyway.

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    Jbmoffo's Avatar
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    Thanks Ape Man. My oil light suddenly went out after I reinstalled my repaired clock and changed the idiot bulbs.
    Any thoughts!?
    I figured I'd try if the switch went bad but I have a feeling it's in the dash circuit under the bulbs.

  5. #4
    cadillacmike68's Avatar
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    Re: '76 Cadillac (500 cu in) Oil Pressure switch location

    You could have a poor connectuiion on the bulbs. They are quite sensitive to being put in just right. Or the bulb could have just blown. It should be a type 194 or 168, both readily available and inexpensive.

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    The Ape Man's Avatar
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    Re: '76 Cadillac (500 cu in) Oil Pressure switch location

    Was the lamp working properly before you did the repair?

    The printed copper circus boards and ribbon connections can quit fairly easily in addition to what Mike posted above.

  7. #6
    Jbmoffo's Avatar
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    Bulb is new. Tried two. Along with original. None work. And it was working before. UGH I figured I'd replace all bulbs before I closed up dash!!

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    The Ape Man's Avatar
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    Re: '76 Cadillac (500 cu in) Oil Pressure switch location

    I'd look for a broken trace leading to the bulb socket. I have not had the pleasure of poking around in that part of a '75 or '76 CDV dash but I assume they use the same construction as Sevilles and later Devilles.

    If it makes you feel any better I replaced all the bulbs in my 1959 Collins 30S-1 amplifier and they quit within 6 months. No fun.

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    Jbmoffo's Avatar
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    Thinking about replacing the whole circuit. Seeing its open I might as well. Hope I don't have to replace in 6 months.
    I have the top part of the dash in place so ill pop it back off and take a closer look. Right now looking into the space, the circuit does not look damaged.

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