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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

anyone else have this MESSED up problem?

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Old Oct 19, 2006 | 04:48 PM
  #1  
maniakmyke's Avatar
maniakmyke
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Question anyone else have this MESSED up problem?

hey everyone this is my first post here thanks for havin me

ok i got a 1991 ford F-150 extended cab its got a 5.0 v8 under the hood AC power windows...heres my problem...

when i pull my headlights on the dash lights go out and i lose my tail lights...but if i fiddle with the headlight **** i can get the dash lights to come on but i lose my headlights (only daytime runners on) but i regain my tail lights. ok first thing your all sayin headlight switch right? thats what i thought...but i was wrong i tried 3 different ones from 3 different dealers in my town all did the same thing... NOW heres where it gets weird...sometimes when i shut off the truck and remove the keys the radio stays on and will not shut off till i pull out the headlight switch and push it back in...the wipers also have this same issue.

so im wondering what in the heck is going on here...bad ground somewhere? does it need an excorsism?

any help is appriciated as i am LOST at this point...

thanks
Mike
 
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Old Oct 19, 2006 | 06:53 PM
  #2  
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MustangGT221
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Sounds like a bad ground or short.
 
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Old Oct 19, 2006 | 07:58 PM
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skyfox10
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From: southwest michigan
ok, first thing. do you have to oem radio/cd player or something else in there

my friend installed his aftermarket radio incorrectly and if he left his headlights on his radio would stay on.

second i would check all of your fuses. that's the ones in the dash and under the hood
 

Last edited by skyfox10; Oct 19, 2006 at 08:02 PM. Reason: typo
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Old Oct 20, 2006 | 04:43 AM
  #4  
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From: cleve,oh
just a thought if you have a aftermarket alarm that turns parklights on when dissarmed i had a 83 cutlass ciera about 9 years ago that when it went took out headlights tailights interior lights and fried the headlight wiring harness
 
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Old Oct 20, 2006 | 08:04 AM
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thanks for the responses guys

to answer some questions no theres is no alarm on the truck and it is the original factory deck in it...its never been removed

im gonna get it in the shop today and let yas know what i came up with

thanks
Mike
 
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Old Oct 20, 2006 | 08:38 AM
  #6  
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From: Easton,Ks
Sounds like your headlight switch plug (connector) is bad.
 
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Old Oct 20, 2006 | 11:29 AM
  #7  
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ok heres the latest...

no broken wires from front to back...all fuses good bo burnt bulbs no bad grounds....

im so at my wits end here hehe

i thought about that plug too ill take a drive to a scrap yard or try a parts store to see if i can get one
 
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Old Oct 20, 2006 | 11:37 AM
  #8  
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MRL123
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From: Wetaskiwin, Alberta
I had a very similar problem with my old Bronco. Take out your brake light assemblies and check the wiring harnesses in behind, especially the grounds that go to the body if there are any coming out of those harnesses. From what you describe it really sounds like a bad ground or the internals of the switch connector are pooched as subford has suggested.

Cheers!

Mike
 
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Old Oct 20, 2006 | 11:38 AM
  #9  
maniakmyke's Avatar
maniakmyke
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yeah i eliminated all the brake light assembly today everything is good on it

made triple sure of that

thanks
 
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Old Oct 20, 2006 | 05:29 PM
  #10  
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mgraveman
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don't go to a junkyard. All fords have a bad one. Go to the dealer and pay the price they want for that plug and just do it. Happened a few times to my truck. Right in the middle of the plug is a big brown burned spot.
 
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Old Oct 20, 2006 | 05:34 PM
  #11  
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I do agree with that burn spot. mgraveman said it buy new.
 
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Old Oct 21, 2006 | 12:31 AM
  #12  
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ness0012
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Call a preist and when your done maybe he can help me with my turn signals!
 
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Old Oct 23, 2006 | 01:32 PM
  #13  
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GonzoCSU
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From: New Hampton, IA
Kinds sounds like the problem I am having with my 89 F250 Diesel. Sometimes when I turn the headlights on I loose headlights, running lights, and power to everything in the cab. I took a volt meter and started testing things and noticed I only had 2.5 volts in the cab. I traced it all the way to a bad connection near the fusable links on the passenger side right where the big wire coming off the starter relay splits into two smaller wires.
 
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