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  1. #1

    Default O.K., I give up....where's the

    under-hood light switch?

    I'm pretty good at such things normally. But, this one has me baffled.

    This is the one on the back edge of the hood, that comes ON when the hood is open, OFF when closed.
    I see it go OFF just before latching. But, no switch/contact to be found.

    ...it's magic.

    It must be at the far end of the hood hinges, under the edge cover, or even back in under the dash....or, something.

    Any hints?
    _____________________________________________
    1991 Chevy C1500 S/W Std Cab 4.3L V6, 5-spd Manual

  2. #2

    Default

    if you can follow the wires from the light to wherever it goes. should go to a switch from there. I dont know since I dont have a light.
    David
    2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
    http://www.gmtruckclub.com/forum/sho...Silverado-2500
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

  3. #3
    Master Mechanic Darknesss23's Avatar
    Join Date
    Jun 2008
    Location
    Brookfield, Ct.
    Posts
    536

    Default

    my dodge light came on when my hood was up... And on my 08 silvy... if you try turning the "bright" switch all the way the interior lights and the bed light comes on so..that might work... ?

    2008 Chevrolet Silverado 1500 LTZ 5.3L EC/Std Bed 4x4 Flexfuel
    Full Metal Jacket Spray on Bed Liner
    Black Powder coat Diamond Plate Weatherguard Tool Box
    Corsa Performance Sport Exhaust System
    K&N Flat Panel OEM replacement Air Filter
    Bridgestone Dueler A/T Revo tires P275/55/R20
    Black Reflective pinstripe and VORTEC hood lettering
    Billet front bowtie
    Rear Bowtie Delete
    Blue strobe grille lights
    Blue strobe rear window lights
    Blue LED Mini Light bar in front Grille

  4. #4

    Default

    Nope, nothing. The Dome Light Switch, on the dash light dimmer works fine. Doesn't affect the under hood light. And, the wires are bundled in a heat shield, makes a big arc and disappears through a hole in the firewall.

    I figured there was a remote contact switch somewhere, connected to this circuit. But, I've traced the entire hood parimeter and there's just flat nothing.

    Something has to trigger it, and the only moving parts are the hinges. They're kind of tucked back into a pocket at the end of the firewall. It's possible the back end of the hinges has a swingarm contact of some kind. I just didn't want to disassemble half the truck to see.

    Welp, when all else fails, look at the manual. I've a Chilton's which I'm not very enamered with.
    Very generalized in most cases. Specifics seem to be stuff I already know.

    I'll report back again.
    _____________________________________________
    1991 Chevy C1500 S/W Std Cab 4.3L V6, 5-spd Manual

  5. #5

    Default

    btw, my "Quick" reply button works only right up to the point of submitting the thing with "Post Quick Reply", then just hangs there forever. I have to Go Advanced to finish posting.

    Is that me, or you guys?
    _____________________________________________
    1991 Chevy C1500 S/W Std Cab 4.3L V6, 5-spd Manual

  6. #6

    Default

    It probably has a mercury switch.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  7. #7

    Default

    Just made short work of the Chilton's manual. It doesn't have anything about the hood light. Just a three count list of instructions for removing the hood, with the 3rd being, "Installation is reverse order", as is customary in their manuals.
    _____________________________________________
    1991 Chevy C1500 S/W Std Cab 4.3L V6, 5-spd Manual

  8. #8

    Default

    Quote Originally Posted by Jimmiee View Post
    It probably has a mercury switch.

    I did actually look for a light sensor switch, the kind you wave your hand in front of to activate.
    _____________________________________________
    1991 Chevy C1500 S/W Std Cab 4.3L V6, 5-spd Manual

  9. #9

    Default

    The mercury switch turns on when the light is raised above horizontal and off again when it hits a horizontal plane. Many vehicles use a switch like this as it saves extra wiring and switches.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  10. #10
    Jr. Apprentice
    Join Date
    Nov 2009
    Location
    Vancouver, WA
    Posts
    26

    Default

    i am pretty sure it is a mercury switch type. It's basically operating on gravity/vertical vs. horizontal position. To test it, try taking the assembly out, holding it horizontal like it would be when the hood is closed, then rotating it up to vertical and it should turn on.
    Of course, if it's working fine.....
    1977 Chevy K10 SWB 4x4 all stock 400SB
    "Work in Progress"

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