Mercury Switch, where is it located?

[Toploader]

On my '86 MGM, the under hood light........I can not find the mercury switch, how does the lamp go off when the hood is closed???

[WagonMan]

The switch is in the housing where the bulb goes. When you open the hood, the ball of mercury slides down to make contact so the light comes on. I remove the bulbs under my hoods, the switch can fail and drain your battery if the light is on with the hood closed. I have a flashlight under the seat of my cars for emergencies. WagonMan

[Toploader]

The switch is in the housing where the bulb goes. When you open the hood, the ball of mercury slides down to make contact so the light comes on. I remove the bulbs under my hoods, the switch can fail and drain your battery if the light is on with the hood closed. I have a flashlight under the seat of my cars for emergencies. WagonMan

Pete bulb in my car just goes into the bulb socket, there is no housing??

[WagonMan]

There must be a spring loaded plunger type switch somewhere along the edge of the fender. Follow the wire from the hood light.
WagonMan

[sly]

The bulb socket has the mercury switch in it. The switch doesn't take up much of any room.

[massacre]

The bulb socket has the mercury switch in it. The switch doesn't take up much of any room.

This is what i was thinking as well. Aero hood and trunk lights are mercury switches and it's part of the socket and not big at all.

[friskyfrankie]

May be able to find a replacement OEM on EBAY if the original is faulty. Not sure if the original question was for informational purposes or there is an issue.