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Guidematic 1977 Eldorado

Started by Dickiebear, August 17, 2022, 12:50:31 AM

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Dickiebear

I have a 1977 Cadillac Eldorado base model. I've been having trouble with the foot switch for the bright lights, when I press it the brights come on but when I release it they go back off. I want to replace the switch but I don't know if my Eldorado has the Guidematic control. How can I tell if my Eldorado has Guidematic?

V63

In the headlight switch if is back labeled with :

1) "LIGHTS" this car has no light options)

2) LIGHTS and SENTINEL  (this car has automatic
dusk/dawn headlights.

3) SENTINEL and DIMMING (this car also has automatic dimming)

4) LIGHTS AND DIMMING (this car has automatic dimming)

The Tassie Devil(le)

G'day Richard,

You have an email from the Moderators that requires your attention.

Thanks,

Bruce. >:D
'72 Eldorado Convertible (LHD)
'70 Ranchero Squire (RHD)
'74 Chris Craft Gull Wing (SH)
'02 VX Series II Holden Commodore SS Sedan
(Past President Modified Chapter)

Past Cars of significance - to me
1935 Ford 3 Window Coupe
1936 Ford 5 Window Coupe
1937 Chevrolet Sports Coupe
1955 Chevrolet Convertible
1959 Ford Fairlane Ranch Wagon
1960 Cadillac CDV
1972 Cadillac Eldorado Coupe

J. Skelly

also refer to the owner's manual on how this system works
Jim Skelly, CLC #15958
1968 Eldorado
1977 Eldorado Biarritz
1971 Eldorado (RIP)

benji808

If it has automatic dimming, there should be a strange-looking "eyeball" under the hood between the radiator and front grille.

To test if it's a switch issue, you can 1) cover this eyeball with a non-reflective cloth (preferably black) to effectively disable it, or 2) you can turn off the auto dimming system using the headlight switch. If I remember correctly there is a small switch that moves left to right above and behind the pull-out headlight switch. If you turn this small switch all the way to the left you should feel a slight "click". This disables the auto-dimming feature.