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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Underhood light

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Old Sep 15, 2012 | 11:13 PM
  #1  
Iron Gorillas's Avatar
Iron Gorillas
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Underhood light

I just purchased a 1986 Ford F150 and I'm going through everything and I noticed that my light under the hood does not come on at all. I replaced the bulb and checked the ground and still nothing. Does anyone have any idea or advise. Is there something I'm supposed to turn on to get it to light up?
 
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Old Sep 15, 2012 | 11:35 PM
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Ken Blythen
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No, they have a mercury switch that closes the circuit when the hood is lifted.

When I first got my truck it's underhood light didn't work either (bulb & wiring was ok), then after a week or so, it mysteriously started turning on, & has been good since.
 
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Old Sep 16, 2012 | 03:45 AM
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From: Lewis Center OH
1983 Underhood light wiring diagram

 
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Old Sep 16, 2012 | 01:37 PM
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The connections at the mercury switch and lamp connections sometimes can get corroded.

That requires to remove the rivets and take the lamp assymbly apart to fix.

Look for green corroded rivets around where the wires enter the lamp assymbly.
 
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Old Sep 16, 2012 | 07:23 PM
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From: Norman, Ar
Originally Posted by Iron Gorillas
I just purchased a 1986 Ford F150 and I'm going through everything and I noticed that my light under the hood does not come on at all. I replaced the bulb and checked the ground and still nothing. Does anyone have any idea or advise. Is there something I'm supposed to turn on to get it to light up?
You should have 12v to the wire all the time. If you do, do as stated before and remove rivets and check for cruddy wiring..

Sometimes,if someone pulled too hard on the light or stretched it out far it could have broke the wire that rewinds..especially at the end next to the light...Hope this helps...Trav..
 
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